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diwethaf

last

AdjectiveB1/dɪu̯ˈɛθav/

"diwethaf" means "last" in Welsh (adjective). Pronounced /dɪu̯ˈɛθav/. Mutation forms: Treiglad Meddal → ddiwethaf, Treiglad Trwynol → niwethaf.

Mutation forms

In Welsh, the first letter of "diwethaf" changes depending on the grammatical context. These are the mutated forms:

MutationForm
Base formdiwethaf
Treiglad Meddalddiwethaf
Treiglad Trwynolniwethaf

"diwethaf" in context

Yma nodir pa mor effeithlon y mae ynni wedi cael ei ddefnyddio yn yr adeilad hwn dros y tri chyfnod cyfrifo diwethaf.

This tells you how efficiently energy has been used in this building over the last three accounting periods.

C1

Ysgrifennydd y Cabinet, hoffwn ddiolch i chi eto am eich datganiad yr wythnos diwethaf ar y Bil diogelwch adeiladau.

Cabinet Secretary, I'd like to thank you again for your statement last week on the building safety Bill.

B2

Rwy'n falch iawn ein bod wedi gallu cyflwyno Bil Diogelwch Adeiladau (Cymru) yr wythnos diwethaf.

I'm delighted that we were able to introduce that Building Safety (Wales) Bill last week.

C1

Yr wythnos diwethaf, cyfarfûm â Skipton, ac rydym hefyd wedi hyrwyddo Cymorth i Aros trwy hysbysebion radio, digidol a phrint.

Last week, I met Skipton, and we've also promoted Help to Stay through radio, digital and print advertising.

C1

Mae'n thema debyg i'ch cwestiwn diwethaf, mewn gwirionedd.

It's a similar theme to your last question, actually.

B2

Further reading

Welsh Mutations Explained — Soft, Nasal & Aspirate →Welsh Pronunciation — It's Actually Easier Than English →How to Learn Welsh as an Adult — A Step-by-Step Roadmap →Best Apps to Learn Welsh (2026) →Browse all Welsh vocabulary →

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Related Welsh words

hwyr

late

newydd

new

ifanc

young

hen

old

olaf

last

nesaf

next

cynnar

early

modern

modern

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