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byth

eternity

NounMasculine (gwrywaidd)A1/bɨːθ/

"byth" means "eternity" in Welsh (masculine noun). Pronounced /bɨːθ/. Mutation forms: Treiglad Meddal → fyth, Treiglad Trwynol → myth.

Mutation forms

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

MutationForm
Base formbyth
Treiglad Meddalfyth
Treiglad Trwynolmyth

"byth" in context

Nid yw un iaith byth yn ddigon.

One language is never enough.

A1

Byth eto.

Never again.

A1

Dwi byth yn codi cyn saith.

I never get up before seven.

B2

Ddyweda i byth wrth neb pwy wyt ti mewn gwirionedd.

I'll never tell anyone who you really are.

A2

Dydy Mennad byth yn siarad am ei hiselder.

Mennad never talks about his depression.

A2

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

Dydd Llun

Monday

Dydd Mawrth

Tuesday

Dydd Mercher

Wednesday

Dydd Iau

Thursday

Dydd Gwener

Friday

Dydd Sadwrn

Saturday

Dydd Sul

Sunday

wythnos

week

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