Chapter IV: Preface (4)

Vi-o-late, _halogi_, _treisio_, _troseddu_

Vi-o-lence, _trais_, _traha_, _gormes_, _gorthrech_

Vi-o-lent, _tanbaid_, _ffyrnig_

Vir-tu-al, _effeithiol_; _gweithredol_

Vir-tu-ous, _rhinweddol_, _effeithiol_; _da_

Vir-u-lence, _gwenwyn_, _adwyth_

Vir-u-lent, _gwenwynig_, _adwythig_

Vis-i-ble, _gweledigaeth_; _gweled_

Vis-it-or, _ymwelydd_, _gofwywr_

Viv-i-fy, _bywio_, _bywiogi_, _bywhau_

Vo-ca-tion, _galw_, _galwad_, _galwedigaeth_

Vol-a-tile, _ffwg_, _a hedo_; _hedin_, _hedegol_

Vol-ca-no, _llosgfal_, _llosgfynydd_

Vol-u-ble, _hydro_, _rhugl_, _hyawdl_, _ffraeth_

Vol-un-teer, _gwirfoddiad_

Vo-mit-ing, _cyfogiad_

Vo-ta-ry, _addunwr_, _ymddiofrydwr_; _diofrydol_, _addunedol_

Voy-ag-er, _mordeithiwr_, _mordwywr_

Vul-gar-ly, _yn gyffredin_, _yn ddifoes_

Walk-ing-stick, _ffon_, _llawffon_

Wal-low-ing, _ymdreiglad_, _ymdryboliad_

Wan-der-er, _crwydryn_, _gwibiad_

Wan-der-ing, _crwydriad_, _disperawd_

Wan-ton-ness, _anlladrwydd_, _nwyfiant_

Watch-ful-ness, _gwyliadwrusrwydd_

Wa-ter-course, _dyfrlle_, _dyfrffos_

Wa-ter-fowl, _dwfraderyn_

Wa-ter-mark, _llifnod_

Wav-er-ing, _anwadal_, _ansefydlog_

Way-far-ing, _teithiol_, _fforddol_

Wea-ri-some, _lluddedawl_, _blinderus_

Weath-er-cock, _ceiliog gwynt_, _awelfynag_

Web-foot-ed, _cyfandroed_

Wed-nes-day, _dydd Mercher_

Weed-ing-hook, _chwynogl_

Wel-com-ing, _croesawiad_

Well-wish-er, _ewyllysiwr da_

West-er-ly, _gorllewinol_

What-ev-er, _pa bynag_, _beth bynag_

Wheel-bar-row, _berfa olwynog_, _berfa_

Where-in-to, _i'r hyn_, _i'r hwn_

Where-ev-er, _yn mha le bynag_

Whim-si-cal, _ysmala_, _hyntiog_

Whis-per-ing, _syganiad_, _sisiad_

Whit-sun-day, _Sulgwyn_

Who-ev-er, _pwy bynag_

Wick-ed-ness, _drygioni_, _anfadrwydd_

Wid-ow-hood, _gweddwdod_

Wil-der-ness, _anialwch_, _diffeithwch_

Wil-ful-ly, _o wirfodd_; _yn ystyfnig_

Wil-ling-ness, _ewyllysgarwch_

Wine-bib-ber, _gwinlyngcwr_, _gwinyfwr_

Wonderful, _rhyfeddol_, _aruthrol_

Work-man-ship, _gweithiant_, _celfyddyd_

Wor-ship-er, _addolwr_, _addolydd_

Wor-ship-ful, _parchedig_, _anrhydeddus_

Wor-thi-ly, _yn deilwng_, _yn addas_

Wretch-ed-ness, _trueni_, _gresyndawd_

Writ-ing-desk, _ysgrifenfwrdd_

Wrong-ful-ly, _yn gamweddus_, _yn feius_

Yel-low-ish, _melynaidd_, _lledfelyn_

Yel-low-ness, _melynder_, _melyni_

Yeo-man-ry, _gwrengiaid_

Yes-ter-day, _doe_

Yes-ter-night, _neithiwr_

Youth-ful-ness, _ieuengctid_

WORDS OF FOUR SYLLABLES.

Ab-bre-vi-ate, _talfyru_, _byrhau_, _cwtogi_

Ab-di-ca-tion, _llysiant_; _ymwrthodiad_

A-bil-i-ty, _gallu_; _medr_, _dawn_, _cymhwysder_, _nerth_

A-bom-in-ate, _casäu_, _ffieiddio_

Ab-so-lute-ly, _yn gwbl_, _yn hollol_; _yn arbenig_

Ab-ste-mi-ous, _sobr_, _cymmedrol_

Ab-sur-di-ty, _afresymoldeb_; _ynfydrwydd_

A-bu-sive-ly, _yn enllibaidd_, _yn oganllyd_; _yn sarhäus_

A-cad-e-my, _prifysgol_, _athrofa_

Ac-cel-er-ate, _prysuro_, _ebrwyddo_

Ac-cep-ta-ble, _derbyniol_, _cymmeradwy_, _boddlawn_

Ac-cep-ta-bly, _yn dderbyniol_, _yn gymmeradwy_

Ac-ces-sa-ry, _cefnogwr_; _cyfranogwr_; _cynnorthwyol_

Ac-ces-si-ble, _dyfodadwy_; _hygyrch_; _mwynaidd_

Ac-ces-so-ry, _cymmodawl_; _cyfranogol_

Ac-ci-dent-al, _damweiniol_, _dygwyddol_

Ac-cliv-i-ty, _esgyniad_, _gallt_, _bronallt_

Ac-com-mo-date, _addasu_; _diwallu_; _cymhwyso_

Ac-com-pa-ny, _cydymdeithio_; _hebrwng_

Ac-com-plish-ment, _cwblhâd_, _addurn_; _cyflawniad_

Ac-cord-ing-ly, _yn gyfatebol_, _yn ganlynol_; _felly_

Ac-count-a-ble, _cyfrifol_, _atebol_

Ac-cu-mu-late, _casglu_, _pentyru_, _tyru_

Ac-cu-ra-cy, _cywreindeb_; _gofal_, _cywirdeb_

Ac-cu-sa-tion, _cyhuddiad_, _cwyn_

Ac-cu-sa-tive, _cyhuddol_

Ac-know-ledg-ment, _cydnabyddiaeth_; _addefiad_

Ac-qui-es-cence, _ymfoddloniad_; _cydsyniad_; _goddefiad_

Ac-qui-si-tion, _caffaeliad_, _cyrhaeddiad_

Ac-tu-al-ly, _yn weithredol_; _mewn effaith_; _yn wir_

Ad-ap-ta-tion, _cyfaddasiad_; _cymhwysder_

Ad-min-is-ter, _gwasanaethu_, _gweinyddu_; _dirprwyo_

Ad-mi-ral-ty, _morlys_, _llyngeslys_

Ad-mi-ra-tion, _rhyfeddiad_, _syndod_; _hoffedd_

Ad-mi-ra-ble, _rhyfeddol_; _da_; _rhagorol_

Ad-mo-ni-tion, _rhybudd_, _cynghor_; _annogaeth_

Ad-o-ra-tion, _addoliad_: _parch_, _anrhydedd_

Ad-van-ta-geous, _buddiol_, _llesol_; _manteisol_

Ad-ver-sa-ry, _gwrthwynebwr_, _gelyn_

Ad-ver-si-ty, _adfyd_, _trallod_, _drygfyd_; _ing_

Ad-ver-tise-ment, _hysbysiad_, _cyhoeddiad_

Ad-vis-a-ble, _cymhwys_, _addas_; _cynghoradwy_

A-dul-ter-ate, _llygru_; _cymmysgu_

A-dul-ter-y, _godineb_, _puteindra_

Af-fec-tion-ate, _serchog_, _caruaidd_

Af-fi-da-vit, _tystlw_, _llw_

Af-fin-i-ty, _cyfathrach_; _tebygoliaeth_

Af-firm-a-tion, _cadarnhâd_, _honiad_

Af-firm-a-tive, _cadarnhaol_, _honiadol_

Ag-i-ta-tion, _cynhyrfiad_, _cyffroad_

Ag-gra-vat-ing, _mwyhaol_, _trymhaol_

Ag-gra-va-tion, _mwyhâd_, _chwanegiad_

A-gree-a-ble, _unol_, _cyfatebol_: _boddus_

Ag-ri-cul-ture, _amaethyddiaeth_, _arddwriaeth_

A-lac-ri-ty, _llawenydd_, _bywiogrwydd_; _parodrwydd_

Al-ien-a-tion, _estroniad_; _trosiad_

Al-le-ga-tion, _honiad_, _gwiriad_, _haeriad_; _dadl_

Al-le-go-ry, _alleg_, _aralleg_, _cyffelybiaeth_

Al-le-vi-ate, _ysgafnhau_, _esmwytho_

Al-low-a-ble, _goddefol_, _caniataol_

Al-ter-a-tion, _cyfnewidiad_, _newidiol_

Al-ter-ca-tion, _ymgecriad_, _ymrafael_

Al-ter-nate-ly, _argylch_, _yn gylchynol_

Al-to-ge-ther, _yn hollol_, _i gyd_, _yn llwyr_

Am-bas-sa-dor, _cenadwr_, _negeswr_

Am-big-u-ous, _amwys_, _amhëus_

A-mel-ior-ate, _diwyllio_, _gwelläu_

A-mi-a-ble, _hawddgar_, _prydweddol_

Am-i-ca-ble, _cyfeillgar_, _cariadus_

Am-mu-ni-tion, _arlwy rhyfel_; _cadarlwy_

Am-phib-i-ous, _deuelfenol_; _cyntefin_

Am-pu-ta-tion, _amdoriad_, _toriad aelod_

A-nal-o-gy, _cydweddiad_, _cyffelybiad_

A-nal-y-sis, _dosraniad_, _dadglymiad_

A-nat-o-my, _difyniaeth_; _attoriaeth_

An-i-mad-vert, _adfrydu_; _barnu_; _ceryddu_

An-i-ma-tion, _bywhad_, _bywiogrwydd_

An-ni-hi-late, _diddymu_, _dyfetha_

An-nu-al-ly, _yn flynyddol_

An-nu-i-ty, _blwyddoseb_, _blwydd-dál_

A-non-y-mous, _anhysbys_, _dienw_

An-swer-a-ble, _atebol_; _cyfrifol_

An-tag-o-nist, _gwrthwynebwr_; _gwrthblaid_

An-te-ce-dence, _rhagflaeniad_, _blaenafiaeth_

An-te-ce-dent, _rhagflaenor_, _blaenor_

An-tic-i-pate, _rhagflaenu_; _rhagweled_

An-tip-a-thy, _gwrthnaws_, _casineb_

An-tip-o-des, _gwrthdroediaid_, _gwrthdraedolion_

An-ti-qui-ty, _hynafiaeth_, _yr amser gynt_

An-tith-e-sis, _cyferbyniaeth_, _gwrthosodiad_

Anx-i-e-ty, _trymfryd_, _pryder gofal_

A-pe-ri-ent, _agorai_; _rhyddhaol_

A-pol-o-gy, _amddiffyniad_; _esgusawd_

Ap-o-plex-y, _menyddwst_, _y parlys mud_

A-pos-tro-phe, _tolnod_: _gwrthdro_; _dadymchwel_

Ap-pa-ra-tus, _offer_, _arfau_; _arlwy_

Ap-pa-rent-ly, _yn amlwg_; _mewn ymddangosiad_

Ap-pel-la-tion, _enwad_; _galwad_; _enw_

Ap-pli-ca-tion, _cymhwysiad_, _cais_; _ymroad_

Ap-po-si-tion, _atosodiad_, _arddodiad_

Ap-pre-ci-ate, _prisio_, _mawrhau_, _gwerthfawrogi_

Ap-pre-hen-sion, _amgyffred_, _deall_; _ofn_

Ap-pro-ba-tion, _cymmeradwyaeth_

Ap-pro-pri-ate, _neillduol_, _priodol_: _priodoli_

Ap-prox-i-mate, _nesu_, _dynesu_, _cyfagosi_

Ap-pur-ten-ance, _perthynoliad_; _perthynas_

Ar-bi-tra-tor, _dyddiwr_, _canolwr_; _cymmrodeddwr_

Ar-bit-ra-ry, _trawsarglwyddol_; _gormesol_

Ar-chi-tec-ture, _adeilyddiaeth_, _pensaernïaeth_

A-rith-me-tic, _rhifyddiaeth_, _rhifyddeg_

Ar-tic-u-late, _llefarol_: _llefaru_

Ar-ti-fi-cial, _celfydd_; _dynwaredol_

Ar-til-ler-y, _cadoffer_; _magnelau_

As-cen-den-cy, _goruchafiaeth_; _awdurdod_

As-pi-ra-tion, _awydd_, _gorawydd_; _ymgais_

As-sas-si-nate, _cuddlofruddio_

As-sid-u-ous, _dyfal_, _diwyd_

As-so-ci-ate, _cydymaith_: _cymdeithasu_

As-ton-ish-ment, _braw_, _synedigaeth_; _syndod_

As-trol-o-gy, _serddewiniaeth_

As-tron-o-my, _seryddiaeth_, _seroneg_

At-tain-a-ble, _cyrhaeddadwy_; _caffaeladwy_

At-ten-tive-ly, _yn ddyfal_, _yn ofalus_

Aug-men-ta-tion, _cynnyddiad_, _mwyhâd_

Au-thor-i-ty, _awdurdod_, _gallu_

Au-tom-a-ton, _hunanysgogydd_

Aux-il-ia-ry, _cynnorthwywr_; _cynnorthwyol_

Av-a-ri-cious, _cybyddlyd_; _crintach_

A-void-a-ble, _gocheladwy_

Bar-bar-i-ty, _babariaeth_; _creulondeb_

Ba-rom-e-ter, _hinfynag_; _awyrfynag_

Bel-lig-er-ent, _rhyfelblaid_; _rhyfelgar_

Ben-e-dic-tion, _bendith_; _bendithiad_

Ben-e-fac-tor, _cymmwynaswr_, _noddwr_

Be-nef-i-cent, _daionus_, _cymmwynasol_

Be-nev-o-lence, _caredigrwydd_; _ewyllys da_; _hoffedd_, _serch_; _elusen_

Be-nev-o-lent, _caredig_; _elusengar_

Be-nig-ni-ty, _tiriondeb_; _haelioni_

Bi-en-ni-al, _dwyflwyddol_, _dwyflwydd_

Bi-og-ra-phy, _bywgraffiad_, _cofiant_

Bi-tu-mi-nous, _duglistaidd_, _llosglysaidd_

Ca-lam-i-ty, _blinfyd_, _drygfyd_; _anffawd_

Cal-cu-la-tion, _cyfrif_; _bwriad_; _barn_

Ca-pac-i-ty, _gallu_; _cymhwysder_; _cyflwr_; _swydd_; _deall_

Cap-i-ta-tion, _peniant_; _treth y penau_

Cap-tiv-i-ty, _caethiwed_; _caethglud_; _alldudiaeth_

Car-nal-i-ty, _cnawdolrwydd_; _trythyllwch_

Car-niv-o-rous, _cigysol_, _cigreibus_

Ca-tas-tro-phe, _gwrthdro_; _anffawd_

Cat-er-pil-lar, _llindys_, _pryf y dail_

Cel-e-bra-tion, _dathliad_; _cyfargofiad_; _clodforiad_

Ce-leb-ri-ty, _enwogrwydd_; _clod_, _bri_

Ce-ler-i-ty, _buander_, _cyflymdra_

Cem-e-ter-y, _claddfa_, _monwent_, _beddrawd_

Cen-so-ri-ous, _hyfeiol_, _enllibus_; _senol_

Cen-trif-u-gal, _canolffo_, _creiddffoawl_

Cen-trip-e-tal, _canolgyrch_, _creiddgyrch_

Cer-e-mo-ny, _defod_, _arfer_, _seremoni_

Cer-tif-i-cate, _tystysgrif_, _tysteb_: _ysgrifdystio_, _tystebu_

Char-ac-ter-ize, _nodweddu_, _arwyddnodi_

Char-i-ta-ble, _hael_, _elusengar_

Chris-tian-i-ty, _cristionogaeth_

Chro-nol-o-gy, _amseryddiaeth_, _amsereg_

Chro-nom-e-ter, _awriadur_; _amseriadur_

Cir-cu-la-tion, _cylchrediad_, _cylchdroad_; _rhediad_; _taeniad_

Cir-cum-cis-ion, _enwaediad_; _blaendoriad_

Cir-cum-fer-ence, _amgylchedd_, _cwmpas_

Co-ag-u-late, _ceulo_, _cawsio_; _ymdewychu_

Co-ef-fi-cient, _cydweithredol_; _cydachosol_

Co-in-ci-dence, _cyttrawiad_, _cytundeb_

Co-in-ci-dent, _cyd-ddygwyddol_, _cytunol_

Col-lat-er-al, _cyfystlysog_, _cyfochrog_; _cyfochrol_, _cyfystlys_

Col-lo-qui-al, _ymddyddanol_, _cydlafarol_

Com-bi-na-tion, _cyfuniad_, _cydsyniad_; _cyssylltiad_, _cydiad_

Com-bus-ti-ble, _dysgymmon_; _hylosg_

Com-fort-a-ble, _cysurus_, _dyddanol_

Com-mem-o-rate, _cyfargofio_, _coffäu_

Com-mend-a-ble, _canmoladwy_, _clodforus_

Com-mend-a-tion, _canmoliaeth_, _cymmeradwyaeth_

Com-ment-a-ry, _esboniad_, _amlygiad_: _esbonio_, _egluro_

Com-mis-er-ate, _tosturio_, _trugarhau_

Com-mis-sion-er, _dirprwywr_, _cynnyrchiolydd_

Com-mo-di-ous, _cyflëus_, _cymhwys_

Com-mod-i-ty, _nwydd_; _eiddo_; _mantais_

Com-mu-ni-cate, _cyfranu_, _cyfranogi_; _mynegi_; _cydio_

Com-mu-ni-ty, _gwladwriaeth_; _y wlad_

Com-mu-ta-tion, _newidiad_, _cyfnewid_; _pridwerth_

Com-par-a-tive, _cymharol_, _cymhariaethol_

Com-pat-i-ble, _cydweddol_, _cysson_

Com-pen-di-um, _crynodeb_, _talfyriad_

Com-pen-sa-tion, _taledigaeth_; _tâl_; _boddloniad_

Com-pe-ti-tion, _cydgais_, _cystadleuaeth_

Com-po-si-tion, _cyfansoddiad_; _rhandaliad_

Con-cav-i-ty, _argeuedd_, _ceuedd_, _ceudod_

Con-cil-i-ate, _cymmodi_, _heddychu_

Con-cep-ti-ble, _dealladwy_

Con-dem-na-tion, _collfarn_; _condemniad_

Con-den-sa-tion, _dwysiad_, _tewhâd_

Con-di-tion-al, _terfyniad_, _ammodiad_; _ammodol_

Con-de-scen-sion, _ymddarostyngiad_

Con-fed-er-ate, _cynghreiriwr_: _cynghreirio_

Con-firm-a-tion, _cadarnhad_, _cryfhâd_

Con-form-i-ty, _cydffurfiad_; _cyssondeb_

Con-ge-la-tion, _cyttewychiad_; _rhewiad_

Con-ge-ni-al, _cydrywiol_; _naturiol_

Con-grat-u-late, _cydlawenhau â_, _cydlawenychu_

Con-gre-ga-tion, _cynnulleidfa_

Con-sci-en-tious, _cydwybodol_

Con-se-quent-ly, _yn ganlyniadol_; _gan hyny_

Con-serv-a-tive, _ceidwadwr_, _diogelwr_; _ceidwadol_, _amddiffynol_

Con-sid-er-ate, _ystyriol_, _pwyllog_

Con-sist-o-ry, _llys yr esgob_, _eglwyslys_

Con-so-la-tion, _cysur_, _dyddanwch_

Con-spic-u-ous, _amlwg_, _eglur_; _enwog_

Con-spi-ra-cy, _cydfradwriaeth_, _brad_

Con-stel-la-tion, _cydser_; _cydseryddiad_

Con-sti-pa-tion, _tynhâd_; _bolrwymedd_

Con-sti-tu-ent, _cyfansoddydd_; _aelod hanfodol_; _cyfansoddol_; _elfenol_

Con-sti-tu-tion, _cyfansoddiad_; _gosodiad_; _gosodiaeth_; _cyfraith_

Con-sult-a-tion, _ymgynghoriad_; _ystyriaeth_

Con-tam-i-nate, _halogi_, _llygru_

Con-tem-pla-tion, _myfyrdod_, _astudiaeth_

Con-tig-u-ous, _cyfagos_, _agos_, _cydiol_

Con-tin-u-al, _parhäus_, _gwastadol_

Con-tin-u-ance, _parhâd_, _para_; _arosiad_

Con-tra-dic-tion, _gwrthddywediad_, _gwrthddadl_; _anghysondeb_

Con-tro-ver-sy, _dadl_, _dadleuaeth_; _amrafael_

Con-va-les-cent, _gwelledig_; _ar wellâd_

Con-ve-ni-ence, _cyfleusdra_; _cymhwysder_

Con-ve-ni-ent, _cyfleus_, _addas_; _gweddaidd_

Con-ver-sa-tion, _ymddyddan_, _cydymddyddan_; _buchedd_; _cynnefindod_

Con-vo-ca-tion, _cymmanfa_, _eisteddfod_

Co-op-er-ate, _cydweithio_, _cydweithredu_

Co-or-di-nate, _cydradd_; _cyfochr_

Cop-u-la-tive, _cydiadol_, _cyssylltiadol_

Cor-ol-la-ry, _casgliad_; _canlyniad_

Cor-o-na-tion, _coroniad_; _taleithiad_

Cor-po-ra-tion, _corfforaeth_; _bwrdeisdref_

Cor-re-spond-ence, _cyfateliad_; _gohebiaeth_

Cor-re-spond-ent, _gohebydd_; _cyfatebwr_

Cor-rob-o-rate, _cyfnerthu_; _sicrhau_

Cor-rupt-i-ble, _llygradwy_

Cred-it-a-ble, _cyfrifol_; _parchus clodfawr_

Cru-ci-fix-ion, _croeshoeliad_

Cu-li-na-ry, _ceginaidd_, _ceginol_

Dan-ger-ous-ly, _yn beryglus_, _yn enbyd_

De-cid-ed-ly, _yn benderfynol_, _yn sicr_

De-bil-i-ty, _gwendid_, _llesgedd_

Dec-la-ra-tion, _mynegiad_, _cyhoeddiad_

Dec-li-na-tion, _gogwyddiad_; _disgyniad_

Dec-o-ra-tion, _addurniad_, _harddiad_

Ded-i-ca-tion, _cyflwyniad_, _cyssegriad_

De-fal-ca-tion, _ysgythiad_; _lleihâd_

Def-am-a-tion, _difenwad_, _enllib_

De-fi-cien-cy, _diffyg_; _pall_, _gwallgofiant_

Def-i-ni-tion, _dosbeniad_, _darluniad_

De-form-i-ty, _anffurfiad_; _hyllrwydd_

De-gen-er-ate, _dirywio_, _gwaethygu_

Deg-ra-da-tion, _diraddiad_; _dirywiad_

De-lib-er-ate, _pwyllog_, _ystyriol_: _ystyried_, _pwyllo_

Del-i-ca-cy, _tegwch_; _manyldeb_

De-lin-e-ate, _darlunio_; _dyfalu_

De-lir-i-ous, _penysgafn_, _gorphwyllog_

De-lir-i-um, _ymleferydd_, _penysgafnder_

De-liv-er-ance, _gwaredigaeth_, _gollyngdod_

De-liv-e-ry, _gwarediad_; _trosglwyddiad_

De-moc-ra-cy, _gweriniaeth_, _gwerinlywodraeth_

Dem-on-stra-tion, _arddangosiad_, _profiad_, _eglurhâd_

De-mor-al-ize, _anfoesoli_; _llygru_

De-nom-i-nate, _enwi_, _cyfenwi_

De-plor-a-ble, _gresynol_, _galarus_

Dep-o-si-tion, _adneuaeth_; _diswyddiad_

Dep-re-da-tion, _anrhaethiad_, _ysbeiliad_

Dep-ri-va-tion, _difuddiad_, _amddifadiad_

Dep-u-ta-tion, _cenadwri_, _cenadaeth_; _dirprwywr_; _dirprwy_

Der-i-va-tion, _tarddiad_, _haniad_; _troad_

De-riv-a-tive, _tarddair_; _hanedig_, _tarddedig_

Des-ig-na-tion, _dynodiad_, _amlygiad_; _arfaeth_; _trefniad_

De-sign-ed-ly, _yn fwriadol_, _yn wirfoddol_

De-sir-a-ble, _dymunadwy_; _dymunol_; _chwennychol_

Des-o-la-tion, _anghyfaneddiad_; _anrhaith_

Des-pi-ca-ble, _dirmygadwy_; _dirmygus_

De-spis-a-ble, _dirmygadwy_

De-spon-den-cy, _gwanobaith_, _digalondid_

Des-ti-na-tion, _bwriad_, _arfaeth_; _perwyl_

Des-ti-tu-tion, _angen_, _eisiau_; _amddifadrwyd_

De-ter-min-ate, _terfynedig_; _penderfynol_

De-test-a-ble, _ffiaidd_, _atgas_, _ysgeler_

Dev-as-ta-tion, _difrod_, _anrheithiad_

De-vi-a-tion, _gwyriad_, _cyfeiliorn_

Dex-ter-i-ty, _deheuder_, _medrusrwydd_

Di-ag-o-nal, _croes_, _traws_; _onglog_

Di-am-e-ter, _tryfesur_, _canolfesur_

Dic-tion-a-ry, _geiriadur_, _geirlyfr_

Dif-fi-cul-ty, _anhawsder_; _anhawdd_

Dim-in-u-tive, _bychanig_; _bychan_

Di-rect-o-ry, _cyfarwyddor_; _cyfarwyddol_

Dis-ad-van-tage, _anfantais_: _colledu_

Dis-a-gree-ment, _anghytundeb_; _gwahaniaeth_

Dis-ap-point-ment, _som_, _somedigaeth_

Dis-con-tent-ment, _anfoddlonrwydd_

Dis-con-tin-ue, _ammharu_; _peidio_

Dis-cov-er-y, _dadguddiad_, _darganfyddiad_

Dis-crim-in-ate, _gwahanredol_: _gwahaniaethu_, _gwahanu_

Dis-fran-chise-ment, _difreiniad_

Dis-hon-est-y, _anonestrwydd_; _twyll_

Dis-in-her-it, _dietifeddu_; _dihawlio_

Dis-loy-al-ty, _anffyddlondeb_; _bradwriaeth_

Dis-or-der-ly, _afreolus_; _yn afreolus_

Dis-pens-a-ble, _hebgoradwy_, _hebgorol_

Dis-pen-sa-tion, _goruchwyliaeth_

Dis-po-si-tion, _trefniad_, _dosbarthiad_; _tuedd_; _ansawdd_

Dis-pro-por-tion, _anghyfartaledd_; _anghyfartalu_

Dis-put-a-ble, _dadleuadwy_; _amhëus_

Dis-sat-is-fy, _anfoddloni_, _anfoddhau_

Dis-si-pa-tion, _gwasgariad_; _gwastraff_

Dis-so-lu-tion, _dattodiad_; _diddymiad_

Dis-til-la-tion, _dystylliad_

Dis-til-ler-y, _dystyllfa_

Dis-tri-bu-tion, _cyfraniad_; _rhanedigaeth_

Di-ver-si-fy, _amrywio_; _gwahanu_

Div-in-a-tion, _dewiniaeth_, _darogan_

Di-vin-i-ty, _dwyfoldeb_; _duwdod_; _duwinyddiaeth_

Di-vis-i-ble, _rhanadwy_, _parthadwy_

Dog-mat-i-cal, _awdurdodaidd_

Dor-mi-to-ry, _hundy_, _ystafell gysgu_

Dox-ol-o-gy, _mawlwers_, _mawlgan_

Dys-en-ter-y, _gwaedlif_, _gwaedglwyf_

E-con-o-my, _cynnildeb_; _trefniant_

Ed-u-ca-tion, _addysg_, _addysgiad_, _dysg_

Ef-fect-u-al, _effeithiol_; _gweithredol_

Ef-fem-i-nate, _gwreigaidd_; _benywaidd_: _gwreigeiddio_, _benyweiddio_

Ef-fer-ves-cence, _brydiad_, _dyferwad_

Ef-fer-ves-cent, _dyfrydol_, _dyferwog_

Ef-fi-ca-cious, _effeithiol_, _grymus_

Ef-front-er-y, _haerllugrwydd_; _hyfdra_

E-lab-o-rate, _cywrain_: _cywreinio_

E-lec-tri-cal, _trydanol_; _gwefrol_

E-lec-tri-fy, _trydanu_; _gwefru_

El-i-gi-ble, _dewisol_, _dymunol_; _teilwng_

El-o-cu-tion, _ffraethoneg_, _hyawdledd_

E-man-ci-pate, _rhydd_: _rhyddhau_

Em-bark-a-tion, _llongiad_; _anturiaeth_

Em-bar-rass-ment, _dyryswch_; _methliad_

Em-bas-sa-dor, _cenadwr_

Em-bez-zle-ment, _darnguddiad_, _celciad_

E-merg-en-cy, _dadymsawdd_; _damwain_; _achlysur_

Em-i-gra-tion, _ymfudiad_; _symmudiad_

E-mol-u-ment, _budd_, _elw_, _mantais_

Em-po-ri-um, _marchnadfa_; _synwyrfa_

Em-u-la-tion, _cyfymgais_, _cystadlaeth_

En-cour-age-ment, _cefnogaeth_, _annogaeth_, _calonogiad_

En-fran-chise-ment, _rhyddfreiniad_; _rhyddhâd_

E-nor-mi-ty, _anfadrwydd_, _ysgelerder_

En-ter-tain-ing, _difyr_, _dyddan_, _boddiol_

En-ter-tain-ment, _croesaw_, _derbyniad_; _gwledd_, _lluniaeth_; _chware_

En-thu-si-asm, _penboethni_, _brwdfrydedd_

E-nu-mer-ate, _rhifo_, _cyfrif_, _rhifnodi_

E-nun-ci-ate, _traethu_, _adrodd_; _cyhoeddi_

Ep-i-dem-ic, _haint ymdaenol_; _ymdaenol_

E-piph-a-ny, _ystwyll_; _yr ymddadgudd_

E-pis-co-pal, _arolygol_, _esgobol_

E-pit-o-me, _crynodeb_, _talfyriad_

E-qual-i-ty, _cyfartaledd_, _gwastadrwydd_

E-ques-tri-an, _marchogol_; _marchol_

E-qui-dis-tance, _cydbellder_, _cysbellder_

E-qui-dis-tant, _cydbell_, _gogysbell_

E-qui-noc-tial, _cyhydeddol_; _cynosol_

E-quiv-a-lence, _cydwerthedd_; _cyfartaledd_: _cyfartalu_; _cystadlu_

E-quiv-a-lent, _cyfwerth_; _cyfystyr_; _cyfartal_, _cystal_

E-quiv-o-cal, _mwysair_; _amwysair_; _amwys_, _deuystyr_

Er-ro-ne-ous, _cyfeiliornus_; _gwallus_

Er-u-di-tion, _dysg_, _dysgeidiaeth_

Es-pe-cial-ly, _yn neillduol_; _yn enwedig_

Es-tab-lish-ment, _sefydliad_; _gosodiad_

Es-ti-ma-tion, _cyfrifiad_, _prisiad_; _parch_, _anrhydedd_

Es-tu-a-ry, _mornant_, _morgaingc_

E-ter-ni-ty, _tragwyddoldeb_

E-vac-u-ate, _gwaghau_; _gadael_

E-van-gel-ist, _efengylwr_

E-vap-o-rate, _tarthu_, _ageru_; _gwasgaru_

E-vent-u-al, _digwyddol_, _damweiniol_

Ev-er-last-ing, _tragwyddoldeb_, _tragwyddol_

Ev-er-y-where, _ym mhob man_, _ym mhob lle_

Ev-i-ta-ble, _gocheladwy_

Ev-o-lu-tion, _dadblygiad_, _treigliaid_

Ex-ag-ger-ate, _mwyhau_, _chwanegu_

Ex-alt-a-tion, _dyrchafiad_, _cyfodiad_

Ex-as-per-ate, _llidio_, _digio_, _cynhyrfu_

Ex-ca-va-tion, _ceuad_, _cafniad_, _cloddiad_

Ex-ceed-ing-ly, _tra_, _dros ben_; _yn rhagorol_; _gormodedd_, _gormod_

Ex-ces-sive-ly, _yn ormodol_; _rhy_, _tra_

Ex-cla-ma-tion, _gwaedd_, _bloedd_, _gorfoledd_

Ex-clu-sive-ly, _yn neillduol_, _o'r neilldu_; _oddi eithr_, _oddigerth_

Ex-cru-ci-ate, _poeni_, _dirboeni_; _poenus_

Ex-cus-a-ble, _esgusadwy_; _esgusodol_

Ex-e-cu-tion, _gwneuthuriad_; _dienyddiad_

Ex-e-cu-tor, _olweinydd_, _cymmynweinydd_, _gweinyddwr_

Ex-em-pla-ry, _dilynwiw_; _engreifftiol_

Ex-em-pli-fy, _engreifftioli_; _arddangos_

Ex-ha-la-tion, _tarthiad_, _agerdd_; _mws_

Ex-hi-bi-tion, _arddangosiad_; _arddangosfa_

Ex-hort-a-tion, _annogaeth_; _cynghoriad_; _rhybudd_

Ex-hu-ma-tion, _dadgladdiad_; _codiad o'r bedd_

Ex-on-er-ate, _dadlwytho_; _rhyddhau_

Ex-or-bi-tant, _dirfawr_, _gormodol_; _afreolus_

Ex-pect-a-tion, _dysgwyliant_; _gobeithiad_

Ex-pe-di-ence, _addasrwydd_; _anturiaeth_

Ex-pe-di-ent, _ffordd_, _modd_, _dyfais_; _cyfaddas_, _cymhwys_

Ex-pe-di-tion, _brys_, _prysurdeb_; _cyflymder_; _rhyfelgyrch_; _llyngesgyrch_

Ex-pend-i-ture, _traul_, _cost_; _treuliad_, _gwariad_

Ex-pe-ri-ence, _profiad_: _ymarfer_: _profi_; _teimlo_

Ex-per-i-ment, _ymbrawf_, _profiad_: _ymbrofi_, _profi_

Ex-pi-a-tion, _cymmod_, _iawn_; _aberth_

Ex-pi-ra-tion, _allananadliad_; _trangc_; _diwedd_

Ex-pla-na-tion, _eglurhâd_, _esboniad_; _amlygiad_

Ex-port-a-tion, _allforiad_, _trosforiad_

Ex-po-si-tion, _eglurhâd_, _esboniad_; _dynoethiad_

Ex-pos-tu-late, _ymliw_; _ymresymu_

Ex-tem-po-re, _yn ddifyfyr_; _yn y man_

Ex-te-ri-or, _y tu allan_; _allanol_, _allan_

Ex-ter-mi-nate, _diwreiddio_; _llwyr ddinystrio_

Ex-tor-tion-er, _cribddeiliwr_, _gorthrymydd_

Ex-trav-a-gance, _rhysedd_, _gormodedd_; _afradlonrwydd_

Ex-trav-a-gant, _afradlawn_; _gormodol_; _afradus_

Ex-trem-i-ty, _eithaf_, _eithafedd_; _cyfyngder_, _gwasgfa_

Ex-u-ber-ance, _arddigonedd_, _helaethrwydd_

Ex-u-ber-ant, _llawn_, _gorlawn_; _helaethlawn_

Fa-cil-i-ty, _rhwyddineb_, _hwylusdod_

Fas-ci-na-tion, _hudoliaeth_; _swyniad_

Fash-ion-a-ble, _arferol_, _defodol_; _dillynwych_

Fa-vour-a-ble, _tirion_, _rhadlawn_; _manteisiol_

Feb-ru-a-ry, _Chwefror_

Fe-lic-i-ty, _dedwyddwch_, _gwynfyd_, _hapusrwydd_

Fer-ment-a-tion, _ymweithiad_, _lefeiniad_

Fe-roc-i-ty, _ffyrnigrwydd_, _creulondeb_

Fer-til-i-ty, _ffrwythlondeb_, _cnydfawredd_

Fes-tiv-i-ty, _llawenydd_, _gorfoledd_

Fi-del-i-ty, _ffyddlondeb_; _gonestrwydd_

Fig-u-ra-tion, _cysgodol_, _arddangosol_; _arwyddluniol_

Fluc-tu-a-tion, _tonogiad_; _bwhwman_; _cyfnewidiad_

Fo-ment-a-tion, _twymolchiad_; _cyffroad_

For-mal-i-ty, _ffurfioldeb_; _ffurf_, _moesddefod_

For-mi-da-ble, _arswydol_, _ofnadwy_, _erchyll_

For-ni-ca-tion, _puteindra_, _godineb_, _aflendid_

Fra-gil-i-ty, _breuder_, _hydoredd_

Fra-ter-ni-ty, _brawdoliaeth_; _cymdeithas_

Fund-a-ment-al, _cyssail_; _rhan hanfodol_; _sylfaenol_

Fu-tu-ri-ty, _dyfodiant_; _peth dyfodol_

Gen-er-al-ly, _yn gyffredinol_, _yn gyffredin_

Gen-er-a-tion, _cenedliad_; _cenedlaeth_; _oes_

Gen-til-i-ty, _boneddigeiddrwydd_; _uchelradd_

Ge-og-ra-phy, _daiaryddiaeth_, _daiarddarluniad_

Ge-ol-o-gy, _daiareg_, _daiarddysg_

Ge-om-e-try, _mesureg_, _mesuryddiaeth_

Glad-i-a-tor, _cleddyfwr_, _ymladdwr_

Grad-u-al-ly, _yn raddol_, _bob yn ychydig_

Gram-mat-i-cal, _gramadegol_

Gra-niv-o-rous, _grawnysol_, _ysrawn_

Gra-tu-i-tous, _anrhegol_; _rhad_; _gwirfoddol_

Grav-i-ta-tion, _dysgyrchiad_, _dymgyrchiad_

Gre-ga-ri-ous, _deadellog_, _minteiawg_

Hab-i-ta-tion, _trigfan_, _annedd_, _cartref_

Ha-bit-u-al, _arferol_, _defodol_; _ansoddol_

Har-mo-ni-ous, _cynghaneddol_, _cydseiniol_

Hes-i-ta-tion, _petrusder_; _geirdagiad_

Het-er-o-dox, _gwrthdybiol_, _geuol_

Hi-ber-ni-an, _Gwyddel_; _Gwyddelig_

His-tor-i-cal, _hanesiol_, _ystorïol_

Hon-our-a-ble, _anrhydeddus_, _parchus_

Ho-ri-zon-tal, _terfyngylch_; _gwastad_

Hor-ti-cul-ture, _garddwriaeth_

Hos-pi-ta-ble, _llettygar_, _croesawgar_

Hos-til-i-ty, _gelyniaeth_; _rhyfel_; _casineb_

Hu-man-i-ty, _dynoliaeth_, _dyngarwch_

Hu-mid-i-ty, _lleithder_, _gwlybrwydd_

Hu-mil-i-ty, _gostyngeiddrwydd_, _difalchedd_

Hy-dro-stat-ics, _dyfrbwysiant_

Hy-per-bo-le, _gormodiaith_, _gorwireb_

Hy-poc-ri-sy, _rhagrith_, _lledrith_, _ffug_

Hy-poth-e-sis, _amcansail_, _tybiaeth_

I-den-ti-cal, _yr un_, _yr unrhyw_; _gwir_

I-den-ti-fy, _unrhywio_, _hunaniaethu_

I-den-ti-ty, _unrhywiaeth_; _yr un peth_

I-dol-a-try, _eilunaddoliaeth_

Ig-no-min-y, _gwarth_; _gwaradwydd_

Il-leg-i-ble, _annarllenadwy_

Il-lit-er-ate, _diddysg_, _anllythrenog_

Il-lus-tra-tion, _eglurhâd_, _deongliad_

Il-lus-tri-ous, _enwog_, _ardderchog_

Im-mac-u-late, _difrycheulyd_, _dihalog_

Im-i-ta-tion, _arddulliad_, _tebygiad_

Im-me-di-ate, _digyfrwng_, _diattreg_

Im-mens-i-ty, _anfeidroldeb_

Im-mod-er-ate, _anghymmedrol_; _afresymol_

Im-mov-a-ble, _diysgog_, _ansymmudol_

Im-mu-ta-ble, _anghyfnewidiol_, _sicr_

Im-pal-pa-ble, _annheimladwy_

Im-ped-i-ment, _attalfa_, _rhwystr_

Im-per-a-tive, _gorchymmynol_; _archadwy_

Im-pe-ri-al, _amherodrawl_

Im-per-fec-tion, _ammherffeithrwydd_

Im-per-ti-nence, _ammherthynas_, _anfoesgarwch_

Im-per-ti-nent, _ammherthynasol_; _haerllug_

Im-pet-u-ous, _egniol_, _gorwyllt_, _ffyrnig_

Im-pla-ca-ble, _anghymmodadwy_; _anfodd_

Im-plic-it-ly, _o guddganlyniad_; _o ganlyniad_

Im-port-a-tion, _atgludiad_

Im-pos-i-tion, _arddodiad_, _ardrethiad_; _gormes_

Im-pos-si-ble, _annichonadwy_, _ammhosibl_

Im-preg-na-ble, _anoresgynadwy_

Im-pris-on-ment, _carchariad_

Im-prob-a-ble, _annhebygol_

Im-pu-ni-ty, _angherydd_, _anghosp_

Im-pu-ri-ty, _ammhuredd_, _aflendid_

Im-pu-ta-tion, _cyfrifiad_

In-ac-cu-rate, _anghywir_; _anghynnil_

In-ad-e-quate, _anghyfaddas_, _anghyfartal_

In-an-i-mate, _difywyd_, _marw_

In-ca-pa-ble, _analluog_, _anaddas_

In-car-cer-ate, _carcharu_, _caethiwo_

In-car-na-tion, _cnawdoliaeth_

In-cli-na-tion, _tueddiad_, _gogwyddiad_

In-co-he-rence, _anghydlyniad_, _anghysondeb_

In-cog-ni-to, _yn ddirgel_, _dan gel_

In-com-pe-tent, _anaddas_, _annigonol_

In-con-sist-ent, _anghydsafol_, _anghytunol_

In-con-ti-nence, _anniweirdeb_, _anymattal_

In-con-ti-nent, _anniwair_, _anllad_

In-cor-po-rate, _corffori_, _cyfuno_, _uno_

In-cred-i-ble, _anhygoel_, _anhygred_

In-crus-ta-tion, _crestiad_, _crawniad_

In-cu-ba-tion, _dëoriad_

In-cul-pa-ble, _difeus_, _difai_

In-cur-a-ble, _anwelladwy_; _anaele_

In-def-i-nite, _anmhenodol_

In-del-i-ble, _annilëadwy_

In-dem-ni-fy, _digolledu_, _sicrhau_

In-dem-ni-ty, _digollediad_; _diogeliad_

In-de-pend-ence, _annibyniaeth_

In-de-pend-ent, _annibynol_

In-di-ca-tion, _dangosiad_; _arwydd_, _nôd_

In-dic-a-tive, _mynegol_, _dangosiadol_

In-dif-fer-ence, _annhueddgarwch_, _difaterwch_, _oerfelgarwch_

In-dif-fer-ent, _annhueddgar_; _diofal_

In-di-ges-tion, _annhreuliad_

In-dig-na-tion, _digofaint_, _soriant_

In-dig-ni-ty, _anmharch_, _anfri_

In-dis-cre-tion, _annoethineb_

In-dus-tri-ous, _diwyd_, _llafurus_

In-e-bri-ate, _meddwi_, _brwysgo_

In-fal-li-ble, _anhyfeth_, _anffaeledig_

In-fe-ri-or, _isafiad_, _israddolwr_; _gwaelach_

In-fin-i-tive, _annherfynol_

In-firm-a-ry, _clafdy_, _ysbytty_

In-firm-i-ty, _gwendid_, _llesgedd_

In-flam-ma-tion, _fflammeg_, _ennynfa_

In-flam-ma-ble, _fflamychadwy_, _hylosg_

In-flex-i-ble, _anhyblyg_, _anystwyth_

In-flu-en-tial, _dylanwadol_, _cynhyrfol_

In-form-a-tion, _hysbysrwydd_; _addysg_

In-fu-ri-ate, _cynddeiriogwyllt_, _ffyrnig_

In-ge-ni-ous, _cywrain_, _athrylithus_

In-grat-i-tude, _anniolchgarwch_

In-gre-di-ent, _cyffyr_, _defnydd_

In-hab-it-ant, _trigiannydd_, _preswyliwr_

In-her-it-ance, _etifeddiaeth_, _treftadaeth_

In-ju-ri-ous, _camweddus_, _niweidiol_

In-i-qui-ty, _drygioni_, _anwiredd_

In-no-va-tion, _defod newidiad_

In-oc-u-late, _impio_, _bywyllu_; _gosod y frech wen_

In-of-fen-sive, _didramgwydd_, _diniwed_

In-qui-si-tion, _chwiliad_, _chwillŷs_

In-quis-i-tive, _ymofyngar_, _holgar_

In-sen-si-ble, _annheimladwy_

In-sid-i-ous, _dichellgar_, _twyllgar_

In-sin-u-ate, _truthymlusgo_, _gwenieithio_

In-sol-u-ble, _annhoddadwy_

In-solv-en-cy, _methdaliad_, _palldaliad_

In-spi-ra-tion, _anadliad_; _ysbrydoliaeth_

In-sti-ga-tion, _cymhelliad_, _annosiad_

In-sti-tu-tion, _gosodiad_, _sefydliad_

In-stru-ment-al, _offerynol_, _defnyddiol_

In-sur-rec-tion, _terfysg_, _gwrthryfel_

In-teg-ri-ty, _uniondeb_, _cywirdeb_

In-tel-li-gence, _dealltwriaeth_; _hysbysrwydd_

In-tel-li-gent, _deallgar_, _synwyrol_

In-tem-per-ance, _anhymer_, _anghymedroldeb_

In-tem-per-ate, _anhymerus_, _anghymedrol_

In-tens-i-ty, _dirfawredd_: _tynder_

In-ter-ces-sion, _cyfryngdod_, _eiriolaeth_

In-ter-ces-sor, _cyfryngwr_, _eiriolydd_

In-ter-est-ing, _pwysfawr_

In-ter-mis-sion, _dysbaid_, _hamdden_

In-ter-nal-ly, _yn dufewnol_

In-ter-ro-gate, _holi_, _gofyn_

In-ter-rup-tion, _rhwystr_, _aflonyddiad_

In-ter-sec-tion, _cynghroesiad_

In-ti-ma-cy, _cyfeillach_, _cydnabyddiaeth_

In-tim-i-date, _digaloni_, _peri ofn_

In-tox-i-cate, _meddwi_, _brwysgo_

In-tran-si-tive, _ansymmudol_, _didrosiad_

In-tri-ca-cy, _astrusi_, _dyryrswch_

In-tro-duc-tion, _rhagymmadrodd_; _rhaglith_

In-val-id-ate, _gwanhau_, _dirymu_

In-ven-to-ry, _dodrefnres_

In-ves-ti-gate, _olrhain_, _chwilio allan_

In-vet-er-ate, _hen_, _sefydlog_

In-vid-i-ous, _cenfigenus_; _atgas_

In-vig-or-ate, _cryfhau_, _bywioli_

In-vin-ci-ble, _anorchfygol_, _anorfod_

In-vis-i-ble, _anweledig_, _anhywel_

In-vi-ta-tion, _gwahoddiad_; _deniad_

In-un-da-tion, _llifddwfr_, _llifeiriant_

I-ron-i-cal, _gwawdieithiol_, _gwatwarus_

I-ron-mon-ger, _haiarn werthwr_

Ir-ra-di-ate, _pelydru_; _goleuo_

Ir-ra-tion-al, _direswm_, _anmhwyllog_

Ir-reg-u-lar, _annhrefnus_, _afreolus_

Ir-res-o-lute, _diymroad_, _anwadal_

Ir-ri-ta-tion, _anfoddogiad_, _cyffroad_

Is-o-lat-ed, _unigol_, _neillduedig_

I-tin-er-ant, _teithiwr_; _teithiol_

Jan-u-a-ry, _Ionawr_

Ju-di-ca-ture, _bradwriaeth_; _brawdlys_

Ju-ris-dic-tion, _awdurdodaeth_, _rhaglawiaeth_

Ju-ris-pru-dence, _deddfwybodaeth_

La-bo-ri-ous, _poenfawr_; _llafurus_

La-ment-a-ble, _galarus_, _gresynol_

La-ment-a-tion, _cwynfan_, _galar_, _galarnad_

Lap-i-da-ry, _gemydd_

Las-civ-i-ous, _anllad_, _nwyfus trythyll_

Leg-is-la-tion, _llywodraethiad_

Leg-is-la-tive, _llywodraeth_, _deddfwyr_

Le-git-i-mate, _cyfreithlawn_: _cyfreithloni_

Lim-it-a-tion, _terfyniad_; _ffin_, _cyffin_

Lit-er-a-ture, _llythyriant_, _llên_, _dysg_

Li-thog-ra-phy, _maengerfiad_

Lo-cal-i-ty, _lleoldeb_, _lleol_

Lo-co-mo-tion, _hunansymmudiad_

Lov-ing-kind-ness, _serch_, _rhad-lonedd_

Lu-min-a-ry, _goleugorff_, _arwawl_

Lux-u-ri-ance, _gormodedd_; _brasdyfiant_

Lux-u-ri-ant, _brasdyfol_, _rhyseddus_

Mag-nif-i-cence, _mawredd_, _ardderchawgrwydd_

Mag-nif-i-cent, _mawrwych_, _ardderchog_

Ma-jor-i-ty, _mwyafiaeth_, _y rhan fwyaf_

Mal-e-dic-tion, _melldith_, _rheg_

Mal-e-fac-tor, _drwgweithredwr_

Ma-lig-ni-ty, _dryganian_, _drygedd_

Mal-le-a-ble, _morthwyliadwy_

Man-i-fes-to, _ardystiad cyhoeddus_, _cylchlythyr_

Man-u-fac-ture, _llaw-waith_; _gwaith_

Ma-te-ri-al, _defnyddiol_, _sylweddol_; _pwysfawr_; _hanfodol_

Ma-te-ri-als, _defnyddiau_, _moddion_

Math-e-mat-ics, _gwyddoniaeth_, _meidri_

Mat-ri-mo-ny, _priodas_, _cydieuad_

Ma-tu-ri-ty, _addfedrwydd_; _llawn dyfiad_

Me-di-a-tor, _cyfryngwr_, _canolwr_

Me-di-a-tion, _cyfryngdod_

Med-i-ta-tion, _myfyrdod_, _ystyriaeth_

Mel-an-cho-ly, _pruddglwyf_, _y ddueg_

Me-lo-di-ous, _perseiniol_, _peroriaethol_

Mem-o-ra-ble, _cofiadwy_, _cofus_; _hynod_

Mem-o-ran-dum, _cofnod_, _cofnodiad_

Me-mo-ri-al, _cofen_, _cofiaeth_, _coffadwriaeth_

Men-su-ra-tion, _mesuriaeth_, _mesureg_

Mer-ce-na-ry, _cyflogddyn_; _cyflogaidd_; _hunanus_

Me-rid-i-an, _canolddydd_; _llinell y canolddydd_

Met-a-mor-phose, _dullnewidio_

Met-a-phys-ics, _athronau_, _arddansoddau_

Me-trop-o-lis, _mamddinas_, _prifddinas_

Mil-i-ta-ry, _milwraidd_, _rhyfelgar_

Mi-nor-i-ty, _maboed_, _mebyd_, _nifer lleiaf_

Mis-cel-la-ny, _amrywiaeth_; _amrywdeb_

Mis-be-hav-iour, _camymddygiad_, _anfoes_

Mis-de-mean-or, _camymddygiad_

Mis-er-a-ble, _gresynol_; _crintach_

Mis-sion-a-ry, _cenadwr_; _cenadol_

Mod-er-a-tion, _cymmedroldeb_; _gweddoldeb_

Mod-u-la-tion, _cyweiriad y llais_, _cynghaneddiad_

Mol-est-a-tion, _aflonyddwch_, _blinder_

Mo-ment-a-ry, _cythrymol_, _diflanedig_

Mon-as-ter-y, _mynachlog_, _mynachlys_

Mo-nop-o-ly, _gorfael_, _edwicaeth_

Mo-ral-i-ty, _moesolaeth_, _moesoldeb_

Mor-tal-i-ty, _marwoldeb_, _marw_

Mu-nic-i-pal, _breiniol_, _bwrdeisiol_

Mu-nif-i-cence, _haelder_, _hael-lioni_

Mu-nif-i-cent, _hael_, _cedrwys_

Mys-te-ri-ous, _dirgel_, _tywyll_, _aneglur_

Myth-ol-o-gy, _chwedlddysg_

Na-tiv-i-ty, _genedigaeth_

Nav-i-ga-tion, _mordwyaeth_, _llongiadaeth_

Ne-ces-sa-ry, _rhaid_, _rheidiol_, _angenrheidiol_

Ne-ces-si-ty, _angenrhaid_, _rhaid_

Nec-ro-man-cy, _gorcheiniaeth_

Ne-fa-ri-ous, _anfad_, _drygionus_

Ne-go-ti-ate, _gorchwylio_; _cyflafareddu_

Nev-er-the-less, _pa fodd bynag_, _etto_, _er hyny_

No-bil-i-ty, _bonedd_; _pendefigion_

Nom-in-a-tion, _enwad_, _penodiad_

Nom-in-a-tive, _enwedigol_

Non-con-form-ist, _anghydffurfiwr_

Non-en-ti-ty, _dihanfodedd_, _diddim_

No-to-ri-ous, _honaid_, _carn_, _hysbys_

Not-with-stand-ing, _er hyny_, _etto_, _anllai_

Nu-mer-a-tion, _rhifiant_, _rhifedigaeth_

O-be-di-ence, _ufudd-dod_; _gwarogaeth_

O-be-di-ent, _ufudd_; _darostyngedig_

Ob-li-ga-tion, _dyled_, _rhwymedigaeth_

Ob-lit-er-ate, _dadlythyru_, _dadoliaw_

Ob-scu-ri-ty, _tywyllni_, _anenwogrwydd_

Ob-serv-a-ble, _nodadwy_, _hynod_

Ob-serv-a-tion, _sylw_, _sylwad_, _nodiad_

Ob-sti-na-cy, _cildynrwydd_, _ystyfnigrwydd_

Ob-tain-a-ble, _cyrhaeddadwy_

Oc-ca-sion-al, _achlysurol_, _damweiniol_

Oc-ci-dent-al, _gorllewinol_

Oc-cu-pa-tion, _meddianniad_; _galwedigaeth_

Of-fi-ci-ate, _gweinidogaethu_

Ol-i-gar-chy, _ambellenigaeth_

Om-nip-o-tence, _hollalluogrwydd_, _'ollallu_

Om-nip-o-tent, _ollnerthog_, _hollalluog_

Om-ni-pres-ence, _hollbresenoldeb_

Om-ni-pres-ent, _hollbresenol_

Op-er-a-tion, _gweithrediad_; _meddygwaith_

Op-po-si-tion, _gwrthwynebiad_

Or-a-to-ry, _areithyddiaeth_

Or-di-na-ry, _rhaglaw esgob_; _bwydfa cyffredin_

Or-di-na-tion, _gosodiad_; _urddiad_

O-ri-ent-al, _dwyreiniwr_; _dwyreiniol_

O-rig-i-nal, _cynysgrif_; _dechreuol_, _gwreiddiol_

O-rig-in-ate, _dechreu_; _tarddu_, _hanu_

Or-na-ment-al, _addurnol_, _addurniadol_

Or-thog-ra-phy, _llythyreniad_; _orgraff_

Os-ten-si-ble, _dangosadwy_; _ymddangosol_

Os-ten-ta-tion, _rhodres_, _gwagymddangosiad_

Os-ten-ta-tious, _rhodresol_; _ymffrostgar_

O-ver-flow-ing, _gorllawndid_, _gorlifiad_

O-ver-look-er, _arolygydd_

O-ver-shad-ow, _argysgodi_, _arhuddo_

O-vip-a-rous, _dodŵyol_, _dodŵynog_

Pal-a-ta-ble, _chwaethus_, _blasus_

Pal-pi-ta-tion, _dychlamiad_; _curiad_

Pa-ren-the-sis, _cromfachau_ (); _ymsang_

Pa-ro-chi-al, _plwyfol_

Par-si-mo-ny, _crintachrwydd_, _cynnildeb_

Par-tic-i-pate, _cyfranogi_, _cael rhan_

Par-ti-ci-ple, _cyfrannai_, _rhangymmeriad_

Par-tic-u-lar, _pwngc_, _neillduolyn_; _penodol_, _neillduol_

Pat-ri-mo-ny, _treftad_, _treftadaeth_

Peace-of-fer-ing, _heddaberth_

Pe-nin-su-la, _gorynys_

Per-ad-vent-ure, _ysgatfydd_, _efallai_

Per-ceiv-a-ble, _dirnadwy_, _canfodadwy_

Per-en-ni-al, _blwyddbaräol_

Per-fo-ra-tion, _trydwll_, _trydylliad_

Per-ish-a-ble, _brau_, _darfodadwy_

Per-mu-ta-tion, _trynewidiaeth_, _cyfnewidiaeth_

Per-pet-u-al, _parhaol_, _gwastadol_

Per-pet-u-ate, _bytholi_, _tragwyddoli_

Per-plex-i-ty, _dyryswch_; _petrusder_

Per-se-cu-tion, _erledigaeth_

Per-se-ver-ance, _parhâd_, _dyfalbara_

Per-son-i-fy, _ansodi_, _dynsodi_, _persenoli_

Per-spic-u-ous, _amlwg_, _eglur_

Per-spi-ra-tion, _chwys_, _tarthiad trwodd_

Pe-ti-tion-er, _erfyniwr_, _eirchiad_

Phe-nom-e-non, _ymddangosiad_; _argoel_

Phi-lan-thro-py, _dyngarwch_

Phi-los-o-phy, _athrolith_, _athroniaeth_

Phre-nol-o-gy, _ymenddysg_, _pendraith_

Po-et-i-cal, _awenawl_, _barddonol_

Po-lit-i-cal, _gwladwriaethol_; _dinasol_

Po-ly-ga-my, _amlbriodas_

Pop-u-la-tion, _poblogiad_; _poblogaeth_

Pos-ter-i-ty, _olafiad_; _hiliogaeth_

Pre-ca-ri-ous, _ansicr_, _ansafadwy_

Pre-cip-i-tate, _chwyrndaflu_; _penchwidro_

Pre-cur-so-ry, _blaenorol_, _blaenawl_

Pred-e-ces-sor, _rhagredwr_, _rhagflaenor_

Pre-des-ti-nate, _rhaglunio_

Pre-dic-a-ment, _cyflwr_, _helynt_, _sefyllfa_

Pre-dom-in-ance, _goruchafiaeth_

Pre-dom-in-ant, _penaf_, _trechaf_

Pre-dom-in-ate, _gorchafu_, _gorchfygu_

Pre-em-i-nence, _rhagoriaeth_

Pre-em-i-nent, _rhagorol_, _ardderchog_

Pre-fer-a-ble, _gwell_, _rhagorach_

Pre-med-i-tate, _rhagfyfyrio_

Prep-a-ra-tion, _paratoad_, _darpariad_

Prep-o-si-tion, _arddodiad_, _rhagair_

Pres-ent-a-tion, _cyflwyniad_; _rhoddiad_

Pres-er-va-tion, _cadwraeth_, _cadwad_

Pres-i-den-cy, _arglwyddiaeth_, _rheolaeth_

Pre-sump-tu-ous, _beiddgar_, _rhyfygus_

Pre-vi-ous-ly, _ym mlaenllaw_

Pri-ma-ri-ly, _yn gyntaf_, _yn benaf_

Pri-or-i-ty, _blaenoriaeth_; _cyndawd_

Proc-la-ma-tion, _cyhoeddiad_

Pro-cras-ti-nate, _oedi_, _gohirio_

Pro-cur-a-ble, _cyrhaeddadwy_, _caffaeladwy_

Prof-it-a-ble, _buddiol_, _llesol_, _ennillfawr_

Prof-li-ga-cy, _anfadedd_

Pro-gen-i-tor, _hynafiad_; _cenedlawr_

Pro-hi-bi-tion, _gwarafuniad_

Pro-lon-ga-tion, _estyniad_, _addoediad_

Pro-mis-cu-ous, _cymmysg_, _plithtraphlith_

Prom-is-so-ry, _addawedigol_, _addewidiol_

Pro-mul-ga-tion, _cyhoeddiad_, _hysbysiad_

Pro-nom-i-nal, _rhagenwawl_

Pro-pen-si-ty, _tueddiad_, _tueddfryd_

Prop-o-si-tion, _testun_; _gosodiad_

Pro-pri-e-tor, _meddiannydd_

Pro-pri-e-ty, _priodoldeb_, _cymhwysder_

Pros-e-cu-tion, _canlyniad_, _erlyniad_

Pros-per-i-ty, _ffyniant_, _llwyddiant_

Pros-ti-tu-tion, _puteindra_, _ymwerthiad_

Prot-est-a-tion, _gorchwiriad_, _ardystiad_

Pro-tu-ber-ance, _oddf_, _crwmp_; _chwydd_

Pro-tu-ber-ant, _hwrwgawl_, _oddfawg_

Pro-verb-i-al, _diarebawl_, _direbawl_

Prov-i-den-tial, _rhagluniaethol_

Prov-o-ca-tion, _annogiant_, _cynhyrfol_

Prox-im-i-ty, _agosrwydd_, _nesder_

Pub-li-ca-tion, _cyhoeddiad_

Punc-tu-a-tion, _gwahan-nodiad_

Pur-ga-to-ry, _purdan_

Pu-ri-fi-er, _purwr_, _coethwr_

Pu-tre-fac-tion, _braeniad_, _malldod_

Pu-tre-fy-ing, _braenllyd_, _crawnllyd_

Ra-di-a-tion, _pelydriad_, _paladriad_

Ra-pid-i-ty, _chwyrnder_

Ra-re-fy-ing, _yn teneuo_, _teneuawl_

Ra-tion-al-ly, _yn rhesymol_

Re-al-i-ty, _gwirionedd_; _sylweddoledd_

Rea-son-a-ble, _rhesymol_, _teg_, _cymhwys_

Re-ceiv-a-ble, _derbyniadwy_

Re-cep-ta-cle, _derbynfa_; _cuddfa_

Re-cip-i-ent, _derbyniedydd_, _derbynydd_

Re-cip-ro-cal, _adgyrchiol_, _cylchgyfnewidiol_

Rec-i-ta-tion, _mynegiaeth_

Re-cog-ni-zance, _cydnabyddiaeth_

Rec-og-ni-tion, _cydnabyddiad_

Rec-ol-lec-tion, _adgofiant_, _adfeddiol_

Re-con-noi-tre, _llygadolrhain_, _adolygu_

Re-cov-er-y, _adgaffaeliad_, _gwelliant_

Rec-re-a-tion, _adloniad_, _difyrwch_

Rec-ti-fi-er, _uniawnydd_, _cywirydd_

Re-en-force-ment, _adgyfnerthiad_

Re-form-a-tion, _diwygiad_, _adffurfiad_

Re-frac-to-ry, _anhydyn_, _cyndyn_

Re-ga-li-a, _teyrnaddurnau_, _teyrndrec_

Re-gen-er-ate, _adgenedlu_, _aileni_

Reg-i-ment-al, _catrodawl_, _byddinol_

Reg-i-ment-als, _byddinwisg_

Reg-u-la-tion, _trefniad_, _rheol_

Reg-u-la-tor, _trefnwr_, _cymmedrolydd_

Re-im-burse-ment, _atdaliad_

Re-it-er-ate, _ad-drethu_, _mynychu_

Re-lax-a-tion, _llacad_; _seibiant_

Re-lax-a-tive, _ymollyngol_, _llacäol_

Re-mark-a-ble, _nodadwy_, _hynod_

Re-mov-a-ble, _symmudadwy_, _mudadwy_

Re-mu-ner-ate, _gwobrwyo_, _atdalu_

Ren-o-va-tion, _adnewyddiad_

Rep-a-ra-ble, _cyweiradwy_

Rep-a-ra-tion, _adgyweiriad_; _iawn_

Re-peat-ed-ly, _yn fynych_, _yn aml_

Rep-e-ti-tion, _adroddiad_, _ailadroddiad_

Re-proach-a-ble, _gwaradwyddadwy_

Rep-ro-ba-tion, _gwrthodedigaeth_

Re-prov-a-ble, _ceryddadwy_, _beiadwy_

Re-pub-lic-an, _gweriniaethwr_; _gweriniaethol_

Re-pu-di-ate, _rhoi ymaith_, _ysgar_

Rep-u-ta-tion, _bri_, _cymmeriad_, _cyfrifiad_

Re-qui-si-tion, _gofyniad_, _galwad_

Res-er-va-tion, _adgadwad_; _darngeliad_

Res-ig-na-tion, _rhoddiad i fyny_

Re-sist-i-ble, _gwrthwynebadwy_

Res-o-lu-tion, _bwriad_, _llawnfryd_, _penderfyniad_

Re-spect-a-ble, _parchus_, _gwiwbarch_

Res-pi-ra-tion, _anadliad_, _adanadl_

Re-spons-i-ble, _attebadwy_, _attebol_

Res-to-ra-tion, _adferiad_, _edfryd_

Res-ti-tu-tion, _adferiad_, _edfrydiad_

Res-ur-rec-tion, _adgyfodiad_

Re-tal-i-ate, _gwrthbwytho_, _dial cam_

Ret-ri-bu-tion, _atdal_, _atdaliad_

Rev-e-la-tion, _datguddiad_, _diargeliad_

Re-verb-er-ate, _gwrthdaro_, _dadseinio_

Rev-o-lu-tion, _chwyl_, _chwyldroad_

Ri-dic-u-lous, _chwerthinus_; _dirmygus_

Ro-ta-to-ry, _cylchawl_, _cylchdroawl_

Ro-tun-di-ty, _crynder_, _bolawd_

Ru-in-a-tion, _andwyad_, _dyfethiad_

Sa-gac-i-ty, _callder_, _doethbwyll_

Sal-i-va-tion, _poerlifiant_, _haliwiad_

Sa-lu-bri-ous, _iachus_, _iachusol_

Sa-lu-bri-ty, _iachusrwydd_

Sal-u-ta-ry, _iachus_, _iechydawl_

Sal-u-ta-tion, _annerchiad_, _cyfarchiad_

Sanc-tu-a-ry, _cyssegr_, _cyssegrfa_

Sa-ti-e-ty, _gwala_, _digon_, _diwallrwydd_

Sat-is-fac-tion, _boddlonrwydd_; _iawn_

Sat-u-ra-tion, _llanwad_, _diwalliad_

Sci-en-tif-ic, _gwybodus_, _celfyddgar_

Sea-son-a-ble, _tymoraidd_, _amserol_, _prydlawn_

Sec-ond-a-ry, _ail_, _o'r ail radd_

Sec-re-ta-ry, _ysgrifenydd_, _ysgrifraglaw_

Se-cu-ri-ty, _diogelwch_; _gwystl_; _sicrwydd_

Sed-en-ta-ry, _eisteddawg_, _eisteddol_

Se-du-li-ty, _dyfalrwydd_, _diwydrwydd_

Self-de-cep-tion, _hunandwyll_

Self-ev-i-dence, _hunanrith_, _hunnandyst_

Sem-i-cir-cle, _hannergylch_

Sem-i-co-lon, _rhagwahanod_ (;)

Sem-in-a-ry, _hadfa_, _magfa_; _ysgol_

Sen-ti-ment-al, _synwyrol_, _ystyriol_

Sep-a-ra-tion, _gwahaniad_; _gwahaniaeth_

Sep-ten-ni-al, _seithmlwyddol_

Se-ren-i-ty, _claerdegwch_, _sirioldeb_

Ser-vice-a-ble, _gwasanaethgar_, _buddiol_

Ser-vil-i-ty, _gwaseidd-dra_; _gorwaelder_

Sev-er-al-ly, _ar wahan_, _yn neillduol_

Sig-nif-i-cance, _arwyddocâd_; _pwysigrwydd_

Sig-nif-i-cant, _arwyddocaol_; _pwysfawr_

Si-mil-i-tude, _cyffelybiaeth_, _cyffelybrwydd_

Sim-plic-i-ty, _symlant_, _symylrwydd_

Sin-cer-i-ty, _cywir_, _diragrithrwydd_

Sin-u-a-tion, _doleniad_, _ystumiad_

Sit-u-a-tion, _sefyllfa_, _gosodiad_; _cyflwr_

So-bri-e-ty, _sobrwydd_; _cymmedroldeb_; _difrifwch_

So-ci-a-ble, _cyfeillgar_, _cymdeithasol_

So-ci-e-ty, _cymdeithas_; _cyfeillach_

So-lem-ni-ty, _edmygedd_, _difrifddwysder_

So-lic-i-tor, _erfyniwr_; _dirprwywr_

So-lic-i-tous, _gofalus_, _pryderus_

So-lic-i-tude, _gofal_, _cur_, _pryder_

So-lid-i-ty, _cyfander_, _sadrwydd_, _sylwedd_

So-lil-o-quy, _hunanymddiddan_, _ymson_

Sol-i-ta-ry, _unig_; _disathr_

Spec-u-la-tion, _brydsylliad_, _rhagdremiad_

Spec-u-la-tive, _golygiadol_, _golygiedigiol_

Spi-nal-mar-row, _madruddyn_

Spir-it-u-al, _ysbrydol_

Spir-it-u-ous, _poethgryf_, _gwirodawl_

Spon-ta-ne-ous, _gwirfoddawl_

Sta-bil-i-ty, _sefydlogrwydd_, _cadernid_

Stand-ard-bear-er, _llumanwr_, _banerwr_

Sta-tion-a-ry, _sefydlog_, _gorsafawl_

Stat-u-a-ry, _delwedydd_

Ster-e-o-type, _ystrydeb_

Ste-ril-i-ty, _diffrwythder_

Stim-u-la-tion, _symbyliad_

Stip-u-la-tion, _ammod_, _ammodiad_

Sub-ju-ga-tion, _dygiad dan iau_

Sub-lim-i-ty, _ucheledd_

Sub-or-din-ate, _israddol_

Sub-se-quent-ly, _yn ganlynol_, _yn ddilynol_

Sub-serv-i-ence, _iswasanaeth_

Sub-serv-i-ent, _gwasanaethgar_

Sub-sti-tu-tion, _dirprwyosodiad_

Suf-fi-cien-cy, _digonedd_, _digonoldeb_

Suf-fo-ca-tion, _mygiad_, _tagiad_

Suf-fo-ca-tive, _mygawl_, _tagiadol_

Suit-a-ble-ness, _cyfaddasrwydd_

Sump-tu-a-ry, _traulgymmedryddol_

Su-per-a-bound, _gormodol_

Su-per-fi-cial, _arwynebol_; _ansylweddol_

Su-per-fi-cies, _arwynebydd_, _clawr_

Su-per-flu-ous, _gormod_, _gormodd_

Su-per-in-tend, _arolygu_, _goruchwyliad_

Su-pe-ri-or, _uwch_, _uwchlaw_, _goruwch_

Su-pe-ri-ors, _blaenoriaid_, _uchafiaid_

Su-per-la-tive, _uchaf_, _uchelaf_

Su-per-scrip-tion, _argraff_, _arlythyriad_

Su-per-sti-tion, _coelgrefydd_, _ofergoel_

Su-per-sti-tious, _coelgrefyddol_, _ofergoelus_

Su-per-vis-or, _ucholygwr_, _arolygydd_

Sup-pli-ca-tion, _deisyfiad_, _ymbiliad_

Sup-po-si-tion, _tyb_; _amcanfwriad_

Su-prem-a-cy, _uwchafiaeth_, _goruchedd_

Sur-mount-a-ble, _gorchfygadwy_

Sus-cep-ti-ble, _derbyngar_; _teimladol_

Sym-met-ri-cal, _cydefsurol_, _cydluniaidd_

Sy-non-y-mous, _cyfystyr_, _cyfenwedig_

Sys-tem-at-ic, _rheolaidd_

Tab-er-na-cle, _pabell_; _trigfan_

Tem-per-a-ment, _tymheredd_; _cyfnaws_

Tem-per-a-ture, _ardymher_, _naws_

Tem-pest-u-ous, _tymhestlog_, _ystormus_

Tem-po-ra-ry, _dros amser_, _amserol_

Te-nac-i-ty, _gafaelgarwch_, _ymlyniad_

Ter-min-a-tion, _diweddiad_, _dybeniad_

Ter-ra-que-ous, _dwfrddaiarol_

Ter-res-tri-al, _daiarol_

Ter-ri-to-ry, _tiriogaeth_; _rhaglawiaeth_

Tes-ti-mo-ny, _tystiolaeth_; _galwad_

The-ol-o-gist, _duwinydd_

The-ol-o-gy, _duwinyddiaeth_, _duwineb_

Ti-mid-i-ty, _ofnusrwydd_, _aneondra_

Tol-er-a-ble, _goddefadwy_, _canolig_

Tol-er-a-tion, _goddefiad_, _caniatâd_

Tor-pid-i-ty, _marweidd-dra_, _cysgadrwydd_

Tra-di-tion-al, _traddodiadol_, _trosglwyddol_

Tran-quil-li-ty, _tawelwch_, _llonyddwch_

Trans-fer-a-ble, _trosglwyddadwy_

Trans-form-a-tion, _ffurfnewidiad_

Trans-pa-ren-cy, _trylowyder_

Trans-port-a-tion, _dëoliad_, _alltudiaeth_

Trans-po-si-tion, _trawsddodiad_

Trib-u-la-tion, _trallod_, _cystudd_, _cyfyngder_

Trib-u-ta-ry, _teyrnged-dalwr_; _trethol_

Tri-en-ni-al, _tairblynyddol_

Tu-mult-u-ous, _terfysgus_, _afreolus_

Ty-ran-ni-cal, _gormesol_, _gorthrymus_

Ul-te-ri-or, _pellach_; _pellaf_

Ul-ti-mate-ly, _o'r diwedd_, _yn olaf_

Ul-ti-ma-tum, _yr olaf_, _ôlgynnyg_

U-nan-i-mous, _unfryd_, _cydsyniol_, _cytun_

Un-be-com-ing, _anweddaidd_, _anaddas_

Un-be-liev-er, _angrhedadyn_, _anffyddiwr_

Un-cer-tain-ty, _anscirwydd_; _anwadalwch_

Un-change-a-ble, _anghyfnewidiol_, _sefydlog_

Un-der-stand-ing, _deall_, _dealltwriaeth_

Un-der-tak-er, _ymgymerwr_, _cymerwr_

Un-der-tak-ing, _gorchwyl_, _ymgymeriad_

Un-der-val-ue, _dibrisio_, _difrïo_

Un-der-writ-er, _ymrwymwr_, _digolliannwr_

Un-dis-put-ed, _diamheuol_, _diddadl_

Un-du-lat-ed, _rhithdonog_, _ar wedd tonau_

Un-du-la-tion, _tonogiad_

Un-du-ti-ful, _anufudd_, _anufuddgar_

Un-ea-si-ness, _anesmwythder_, _anhawsder_

Un-ex-pect-ed, _annysgwyliedig_

Un-for-giv-ing, _anfaddeuol_, _annhrugarog_

Un-for-sak-en, _heb ei adaw_, _heb ei adu_

Un-for-tu-nate, _anffodiog_, _anhapus_

U-ni-ver-sal, _cyffredinol_, _hollol_

Un-lim-it-ed, _diderfyn_, _anmhennodol_

Un-mer-ci-ful, _annhrugarog_

Un-pro-pi-tious, _annhosturiol_, _digyfrwydd_

Un-quench-a-ble, _anniffoddadwy_

Un-search-a-ble, _anchwiliadwy_

Un-speak-a-ble, _annhraethadwy_

Un-stead-i-ness, _anwadalwch_, _ansadrwydd_

Un-suc-cess-ful, _aflwyddiannus_, _anffodus_

Un-us-u-al, _anarferol_, _anghyffredin_

U-sur-pa-tion, _trawsfeddiant_, _camrwysg_

U-til-i-ty, _defnyddioldeb_, _budd_, _lles_

Ut-ter-a-ble, _traethadwy_, _dywedadwy_

Val-e-dic-tion, _iacheirchiad_

Va-lid-i-ty, _cadernid_, _grym_, _nerth_

Val-u-a-ble, _gwerthfawr_, _prid_

Val-u-a-tion, _cywerthyddiad_, _prisiad_

Vap-o-ra-tion, _tarthiad_, _mwgdarthiad_

Va-ri-a-ble, _ansefydlog_, _cyfnewidiol_

Va-ri-a-tion, _amrafaeliad_; _gwyrad_

Va-ri-e-gate, _amryliwio_; _amrywio_

Va-ri-e-ty, _amrywiaeth_; _newid_

Veg-e-ta-ble, _llysieyn_; _llysieuog_, _tyfawl_

Veg-e-ta-tion, _hydyfiant_, _tyfiad llysiau_

Ve-loc-i-ty, _buander_, _cyflymdra_

Ven-er-a-ble, _hybarch_, _parchus_

Ven-er-a-tion, _anrhydedd_, _dyfriad_

Ven-ti-la-tion, _gwyntylliad_, _nithiad_

Ven-ti-la-tor, _gwyntyll_, _gwyntydd_

Ven-tril-o-quist, _bol-lafarwr_

Ve-rac-i-ty, _geirwiredd_; _gwirionedd_

Vi-ca-ri-ous, _dirprwyol_

Vi-cin-i-ty, _cymmydogaeth_: _agosrwydd_

Vi-cis-si-tude, _cyfnewidioldeb_, _cylchdroad_

Vic-to-ri-ous, _buddugawl_, _gorchfygol_

Vin-di-ca-tion, _amddiffyniad_

Vin-di-ca-tor, _amddiffynwr_, _diffynwr_

Vin-di-ca-tive, _dïaleddol_, _dïalgar_

Vi-o-la-tion, _toriad_; _treisiad_, _halogiad_

Vir-gin-i-ty, _morwyndod_; _diweirdeb_

Vir-tu-al-ly, _mewn effaith_, _yn weithredol_

Vis-it-a-tion, _ymweliad_, _gofwy_

Vi-vac-i-ty, _bywiogrwyddd_, _hawnt_

Vi-vip-a-rous, _bywhiliog_

Vo-cif-er-ous, _bloeddfawr_, _banllefol_

Vol-un-ta-ry, _gwirfoddol_, _ewyllysgar_

Vo-lup-tu-ous, _glwth_, _gloth_, _glythig_

Vul-gar-i-ty, _difoesedd_

Whence-so-ev-er, _o ba le bynag_

When-so-ev-er, _pa bryd bynag_

Where-so-ev-er, _pa le bynag_

Whom-so-ev-er, _pwy bynag_

Whose-so-ev-er, _pwy bynag_

Zo-ol-o-gy, _milhanes_, _mildraethawd_

WORDS OF FIVE SYLLABLES.

Ab-bre-vi-a-tion, _byrhâd_, _talfyriad_, _darnair_

A-bom-in-a-ble, _ffiaidd_, _atgas_

A-bom-in-a-tion, _ffieiddiant_, _atgasrwydd_

Ab-o-rig-i-nes, _cynfrodorion_

Ac-cel-er-a-tion, _prysuriad_, _cyflymiad_

Ac-ci-dent-al-ly, _yn ddamweiniol_

Ac-com-mo-da-tion, _addasiad_, _cyfaddasiad_; _lletty_, _cyfleusdra_

Ac-cu-mu-la-tion, _tyriad_, _pentyriad_

Ad-min-is-tra-tion, _gwasanaethiad_, _gweinyddiaeth_; _trefniad_

A-dul-ter-a-tion, _gwaethygiad_; _godineb_

An-i-mos-i-ty, _dygasedd_, _gelyniaeth_

Ar-is-toc-ra-cy, _pendefigaeth_; _y pendefigion_

Ar-tic-u-la-tion, _llafariad_, _seiniad_

As-sas-sin-a-tion, _murniad_, _bradlofruddiad_

As-si-du-i-ty, _dyfalwch_, _diwydrwydd_

As-so-ci-a-tion, _cymdeithasiad_, _cymmanfa_

Ca-pa-bil-i-ty, _gallu_, _galluogrwydd_

Cer-e-mo-ni-al, _defodlyfr_; _defodol_

Cer-e-mo-ni-ous, _defodgar_; _ffurfiol_

Char-ac-ter-is-tic, _nodwedd_; _nodweddol_

Cir-cum-lo-cu-tion, _cylchymadrodd_

Civ-il-i-za-tion, _gwareiddiad_, _moesoliad_

Com-mem-o-ra-tion, _cyfargofiant_, _coffâd_

Com-mis-er-a-tion, _tosturi_, _trugaredd_

Com-mu-ni-ca-tion, _cyfraniad_; _ffordd_, _cyfrwng_

Con-fed-er-a-cy, _cyngrair_; _cyfammod_

Con-sid-er-a-ble, _o bwys_; _pwysig_

Con-sid-er-a-tion, _ystyriaeth_; _cyfrifoldeb_

Con-sol-i-da-tion, _cyfaniad_, _cydsylweddiad_

Con-tem-po-ra-ry, _cyfoed_, _cydoeswr_; _cyfoesol_

Cred-i-bil-i-ty, _gwiwgoeledd_, _coeledigaeth_

Cu-ri-os-i-ty, _manylwch_, _cywreinrwydd_

Del-e-te-ri-ous, _dinystriol_, _adwythig_

De-lib-er-a-tion, _pwyllogrwydd_, _ystyriaeth_

De-lin-e-a-tion, _darluniad_; _llinelliad_

De-nom-i-na-tion, _enw_; _enwad_; _plaid_

De-nun-ci-a-tion, _cyhoeddiad_; _traethiad_

De-pos-i-ta-ry, _adneuwr_; _ymddiriedai_

De-pos-i-to-ry, _ystorfa_, _ystorgell_

De-sid-er-a-tum, _dymunolbeth_; _chwennychbeth_

De-ter-i-o-rate, _gwaethygu_; _gwanhau_

De-ter-mi-na-tion, _penderfyniad_; _bwriad_; _diweddiad_

Di-lap-i-da-tion, _adfeiliad_; _dystryw_

Dis-a-bil-i-ty, _anallu_, _gwendid_

Dis-ad-van-ta-geous, _anfanteisiol_; _anfuddiol_

Dis-a-gree-a-ble, _anhyfryd_; _diflas_

Dis-ap-pro-ba-tion, _anghymmeradwyaeth_

Dis-crim-in-a-tion, _gwahaniaeth_; _gwahannodiad_

Dis-in-cli-na-tion, _annhuedd_, _anewyllysgarwch_

Dis-in-ter-est-ed, _diduedd_; _ammhleidgar_

Dis-o-be-di-ent, _anufudd_, _cyndyn_

Dis-sim-u-la-tion, _ffuant_, _rhagrith_

Ec-cen-tric-i-ty, _echreiddigrwydd_, _afreoleiddrwydd_

Ec-cle-si-as-tic, _gwr eglwysig_, _eglwyswr_

E-co-nom-i-cal, _trefniadol_; _cynnil_

Ed-i-fi-ca-tion, _adeiladaeth_; _addysgiad_

E-lec-tri-ci-ty, _trydan_, _trydaniaeth_

El-e-ment-a-ry, _elfenol_, _egwyddorol_

E-man-ci-pa-tion, _rhyddhâd_, _rhyddfreiniad_

E-nu-mer-a-tion, _rhifiad_, _cyfrifiad_

E-nun-ci-a-tion, _traethiad_; _hysbysiad_

E-qual-i-za-tion, _cyfartaledd_; _cystadliad_

E-qua-nim-i-ty, _gwastadfrydedd_

E-qui-lib-ri-um, _cydbwysedd_, _cydfantoledd_

Et-y-mol-o-gy, _geirdarddiad_; _gwraidd_

E-vac-u-a-tion, _gwaghâd_; _ymadawiad_

Ev-an-gel-i-cal, _efengylaidd_

E-vap-o-ra-tion, _tarthiad_, _ageriad_

Ex-ag-ger-a-tion, _mwyhâd_, _ychwanegiad_

Ex-am-i-na-tion, _holiad_, _ymofyniad_

Ex-as-per-a-tion, _llidiad_, _cyffroad_; _digofaint_

Ex-com-mu-ni-cate, _esgymmuno_; _diarddel_

Ex-e-cu-tion-er, _dienyddwr_; _crogwr_

Ex-per-i-ment-al, _profiadol_; _ymarferol_

Ex-pos-tu-la-tion, _ymliwiad_; _ymresymiad_

Ex-tem-po-ra-ry, _difyfyr_, _disymmwth_

Ex-ten-u-a-tion, _lleihâd_; _esgusodiad_

Ex-ter-mi-na-tion, _dadwreiddiad_; _dilead_

For-ti-fi-ca-tion, _caerwaith_; _amddiffynfa_

Gen-e-al-o-gy, _ach_, _llinach_; _achyddiaeth_

Gen-er-os-i-ty, _haelioni_, _rhoddgarwch_

Glo-ri-fi-ca-tion, _gogoneddiad_

Grat-i-fi-ca-tion, _boddhâd_; _taliad_

He-red-i-ta-ry, _etifeddawl_, _treftadawl_

Hos-pi-tal-i-ty, _llettygarwch_

Hu-mil-i-a-tion, _ymostyngiad_; _iselhâd_

Hy-dro-pho-bi-a, _cynddaredd_, _cynddeiriogrwydd_

Il-le-git-i-mate, _basdarddol_; _anghyfreithlawn_

Il-lu-mi-na-tion, _goleuad_, _llewyrchiad_

Im-ag-i-na-ry, _dychymmygol_; _tybiol_

Im-ag-i-na-tion, _dychymmyg_; _amgyffred_

Im-be-cil-i-ty, _eiddilwch_, _gwendid_

Im-ma-te-ri-al, _annefnyddiol_; _ysbrydol_

Im-meas-u-ra-ble, _anfesurol_; _difesur_

Im-me-di-ate-ly, _yn ddiaros_, _yn ddioed_

Im-me-mo-ri-al, _cyn cof_; _hen_

Im-mor-tal-i-ty, _anfarwoldeb_

Im-per-cep-ti-ble, _annirnadwy_, _anweladwy_

In-a-bil-i-ty, _anallu_, _annerth_

In-ac-tiv-i-ty, _diweithedd_, _anweithgarwch_

In-au-gu-ra-tion, _urddfreiniad_; _coroniad_

In-cal-cu-la-ble, _anghyfrifadwy_

In-ca-pac-i-tate, _anaddasu_

In-cen-di-a-ry, _ffaglydd_; _terfysgwr_

In-com-mo-di-ous, _anghyfleus_

In-com-pat-i-ble, _anghydweddol_

In-com-pe-ten-cy, _anghymwysder_

In-con-ceiv-a-ble, _annirnadwy_

In-con-sid-er-ate, _anystyriol_, _byrbwyll_

In-con-sist-en-cy, _anghydweddiad_

In-con-ve-ni-ence, _anghyfleusdra_

In-con-ve-ni-ent, _anghyfleus_

In-cor-po-ra-tion, _cydgorfforiad_

In-cor-ri-gi-ble, _anniwygiadwy_

In-cre-du-li-ty, _anghrediniaeth_

In-dis-crim-in-ate, _diwahân_

In-dis-po-si-tion, _anhwyl_; _annhuedd_

In-dis-pu-ta-ble, _diddadl_

In-di-vid-u-al, _un_, _undyn_, _un neillduol_

In-e-qual-i-ty, _anghyfartaledd_

In-e-qui-va-lent, _anghyfwerth_; _rhy fyr_

In-ev-i-ta-ble, _anocheladwy_

In-ex-cus-a-ble, _diesgus_

In-ex-pe-di-ence, _anaddasrwydd_

In-ex-pe-di-ent, _anghyfaddas_; _anaddas_; _anfuddiol_

In-ex-pe-ri-ence, _diffyg ymbrawf_; _anymarferiaeth_

In-fi-del-i-ty, _anffyddiaeth_

In-ge-nu-i-ty, _cywreinrwydd_

In-hu-man-i-ty, _creulondeb_, _cieidd-dra_

In-im-i-ta-ble, _anefelychadwy_; _rhagorol_

In-nu-mer-a-ble, _aneirif_, _afrifed_

In-oc-u-la-tion, _llygadimpiad_

In-sep-a-ra-ble, _anwahanadwy_

In-sig-nif-i-cance, _ansylwedd_

In-sig-nif-i-cant, _disylwedd_, _dibwys_

In-sin-u-a-tion, _truthymlusgiad_

In-sta-bil-i-ty, _anwadalwch_

In-stan-ta-ne-ous, _cythrymol_, _disyfyd_

In-suf-fer-a-ble, _annyoddefadwy_

In-sur-mount-a-ble, _anorchfygadwy_

In-tel-lect-u-al, _deallawl_, _dealledigol_

In-tel-li-gi-ble, _dealladwy_

In-ter-lo-cu-tion, _cydsiarad_

In-ter-pre-ta-tion, _dehongliad_

In-ter-ro-ga-tion, _holiad_; _nod o holiad_ (?)

In-tol-er-a-ble, _anoddefadwy_

In-tox-i-ca-tion, _meddwdod_

In-tre-pid-i-ty, _glewder_, _dewrder_

In-val-u-a-ble, _uwchlaw gwerth_, _tragwerthfawr_

In-va-ri-a-ble, _digyfnewid_

In-ves-ti-ga-tion, _olrheiniad_

In-vol-un-ta-ry, _anfoddus_, _anewyllysgar_

Ir-re-proach-a-ble, _difefl_, _diwarth_

Ir-re-sist-i-ble, _anwrthwynebol_

Ju-di-ca-to-ry, _brawdle_, _llys barn_

Jus-ti-fi-ca-tion, _cyfiawnhad_

Jux-ta-po-si-tion, _cyferbyniad_

Lab-o-ra-to-ry, _gweithdy_; _fferylldy_

Le-git-i-ma-cy, _cyfreithlonedd_

Lib-er-al-i-ty, _haelioni_, _haelder_

Ma-gis-te-ri-al, _awdurdodaidd_; _uchelfalch_

Mag-na-nim-i-ty, _mawrfryd_, _mawrfrydigrwydd_

Man-u-fac-to-ry, _gweithfa_; _gwaith_

Ma-te-ri-al-ly, _o lawer_; _yn hanfodol_

Math-e-mat-i-cal, _gwyddonawl_, _arddangosyddol_

Me-di-oc-ri-ty, _canoledd_; _cymmedrolder_

Mer-it-o-ri-ous, _teilwng_; _dybrynawl_

Mis-cel-la-ne-ous, _amrywiol_, _amryfath_

Mod-i-fi-ca-tion, _agweddiad_, _dulliad_

Mon-o-syl-la-ble, _unsillair_, _gair unsill_

Mor-ti-fi-ca-tion, _madreddi_; _siomedigaeth_

Mu-ta-bil-i-ty, _anwadalwch_

Ne-go-ti-a-tion, _negeseuaeth_; _cyflafaredd_

No-to-ri-e-ty, _hynodrwydd_; _erchylldra_

O-bit-u-a-ry, _marwrestr_

Ob-serv-a-to-ry, _tremynfa_, _arsyllfa_

Op-por-tu-ni-ty, _amser_, _cyfleusdra_, _adeg_

Or-gan-i-za-tion, _iawnffurfiad_, _iawnosodiad_

Pa-ci-fi-ca-tion, _heddychiad_; _dyhuddiad_

Par-si-mo-ni-ous, _cynnil_, _arbedus_, _cybyddlyd_

Pe-ri-od-i-cal, _cylchawl_, _cylchynawl_

Per-pen-dic-u-lar, _unionsyth_, _unionseth_

Po-ly-syl-la-ble, _amlsillawg_, _amlsill_

Pre-cip-i-ta-tion, _chwidrfrys_, _tafliad_

Pre-des-ti-na-tion, _rhagdrefniad_

Pre-lim-i-na-ry, _rhagammod_; _rhagsail_; _rhagammodol_; _rhagarweiniol_

Pre-med-i-ta-tion, _cynarfaethiad_

Pre-par-a-to-ry, _darpariadol_

Prin-ci-pal-i-ty, _tywysogaeth_

Prob-a-bil-i-ty, _tebygolrwydd_

Pro-cras-ti-na-tion, _addoediad_, _oediad_

Pro-nun-ci-a-tion, _aceniad_; _traethiad_

Pro-pi-ti-a-tion, _dihuddiant_, _heddychiad_, _cymmod_; _iawn_

Prov-i-den-tial-ly, _yn rhagluniaethol_

Pu-ri-fi-ca-tion, _purad_, _puredigaeth_

Pu-sil-lan-i-mous, _gwangalon_, _llwfr_

Qua-li-fi-ca-tion, _cymhwysder_, _dawn_

Rat-i-fi-ca-tion, _cadarnhâd_, _sicrhâd_

Re-ca-pit-u-late, _ailbenodi_, _ailadrodd_

Rec-om-mend-a-ble, _canmoladwy_

Rec-om-mend-a-tion, _canmoliaeth_; _cymmeradwyaeth_

Rec-on-cil-a-ble, _cymmodadwy_

Re-cov-er-a-ble, _adenilladwy_, _gwelladwy_

Re-crim-i-na-tion, _gwrthgyhuddiad_

Re-gen-er-a-tion, _adgenedliad_, _adenedigaeth_

Reg-u-lar-i-ty, _rheoleiddrwydd_

Re-nun-ci-a-tion, _ymwrthodiad_

Re-pos-i-to-ry, _ystorfa_, _ystordy_, _trysorfa_

Rep-re-sent-a-tion, _arddangosiad_; _cynnyrchioliad_

Rep-re-sent-a-tive, _cynnyrchiolwr_; _dangosedigol_

Re-serv-a-to-ry, _ystordy_

Re-ta-li-a-tion, _atdaliad_, _gwrthbwyth_

Re-ver-ber-a-tion, _gwrthdroad_; _gwrthseiniad_

Sanc-ti-fi-ca-tion, _santeiddiad_; _purdeb_

Sat-is-fac-to-ry, _boddhaol_, _boddlongar_

Sen-si-bil-i-ty, _teimladrwydd_, _tynerwch_

Sen-su-al-i-ty, _cnawdolrwydd_

Sig-ni-fi-ca-tion, _arwyddocâd_, _ystyr_

Sim-i-lar-i-ty, _cyffelybrwydd_

Sim-ul-ta-ne-ous, _cydweithredol_

Sin-gu-lar-i-ty, _neillduolrwydd_, _hynodrwydd_

Sol-em-ni-za-tion, _difrifgadwad_; _gweinyddiad_

So-lic-i-ta-tion, _taerddeisyfiad_

Sti-pen-di-a-ry, _cyflogddyn_

Sub-or-di-na-tion, _israddoliaeth_

Sub-sid-i-a-ry, _cynnorthwyol_

Sub-ter-ra-ne-ous, _tanddaiarawl_

Su-per-a-bun-dance, _arddigonedd_, _gormodedd_

Su-per-a-bun-dant, _gormodawl_

Su-per-an-nu-ate, _oedfreinio_; _gorflwyddiant_

Su-per-flu-i-ty, _gorddigonedd_

Su-per-in-tend-ence, _arolygiad_, _golygiad_

Su-per-in-tend-ent, _arolygwr_, _goruchwyliwr_

Su-per-nat-u-ral, _goruchnaturiol_

Tac-i-turn-i-ty, _dystawrwydd_

Ter-ri-to-ri-al, _tiriogaethol_

Tes-ta-ment-a-ry, _cymmynawl_

Tes-ti-mo-ni-al, _tystlythyr_; _tystiolaethol_

Trans-fig-u-ra-tion, _trawsddulliad_, _gweddnewidiad_

Tran-sub-stan-ti-ate, _trawssylweddu_

Trig-o-nom-e-try, _trionglaeth_

Un-ac-count-a-ble, _annirnadwy_, _dieithr_

U-na-nim-i-ty, _unfrydedd_, _cydsyniad_

Un-com-fort-a-ble, _anghysurus_, _digysur_

Un-con-quer-a-ble, _anorchfygol_

Un-cul-ti-va-ted, _anwrteithiol_; _diddysg_; _heb ei drin_

Un-de-vi-at-ing, _anwyrol_, _anymgrwydrol_

Un-ex-pe-di-ent, _anghyfleus_, _anaddas_

U-ni-form-i-ty, _unffurfiad_, _unweddiad_

Un-ne-ces-sa-ry, _afreidiol_, _diraid_

Un-par-don-a-ble, _anfaddeuadwy_

Un-prof-it-a-ble, _difudd_, _dielw_

Un-rea-son-a-ble, _afresymol_, _direswm_

Un-sea-son-a-ble, _annhymmig_, _anamserol_

Un-sep-a-ra-ble, _anwahanadwy_

Un-suf-fer-a-ble, _anoddefadwy_, _anoddefol_

Va-ri-a-ble-ness, _anwadalwch_, _amrywioldeb_

Ver-i-fi-ca-tion, _gwiriad_, _gwirioneddiad_

Ver-si-fi-ca-tion, _prydyddiaeth_, _mydraeth_

Vet-er-i-na-ry, _milfeddygol_

Vo-cab-u-la-ry, _geirlyfryn_

Vo-cif-e-ra-tion, _crochfloedd_, _banllefiad_

Vo-lun-ta-ri-ly, _yn ewyllysgar_

APPENDIX.

ENGLISH-WELSH DIALOGUES.

ATTODIAD.

CYDYMDDYDDANION SAESNEG A CHYMRAEG.