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diolch

thank you

phraseA1

"diolch" means "thank you" in Welsh (phrase). Mutation forms: Treiglad Meddal → ddiolch, Treiglad Trwynol → niolch.

Mutation forms

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

MutationForm
Base formdiolch
Treiglad Meddalddiolch
Treiglad Trwynolniolch

"diolch" in context

Diolch.

Thanks.

A1

Diolch!

Thank you!

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Diolch, Yukina.

Thanks, Yukina.

A1

Diolch am edrych ar ôl y plant.

Thanks for taking care of the kids.

A1

Diolch yn fawr!

Thank you very much!

A1

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

bore da

good morning

prynhawn da

good afternoon

nos da

good night

helo

hello

hwyl fawr

goodbye

os gwelwch yn dda

please

croeso

welcome/you're welcome

esgusodwch fi

excuse me

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