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diderfyn

endless

AdjectiveC2/diˈdɛrvɨ̞n/

"diderfyn" means "endless" in Welsh (adjective). Pronounced /diˈdɛrvɨ̞n/. Mutation forms: Treiglad Meddal → ddiderfyn, Treiglad Trwynol → niderfyn.

Mutation forms

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

MutationForm
Base formdiderfyn
Treiglad Meddalddiderfyn
Treiglad Trwynolniderfyn

"diderfyn" in context

Gadawodd farc ar bawb a oedd yn ei adnabod, drwy ei chwerthin, ei ddeallusrwydd, ei egni diderfyn, a'i allu rhyfeddol i hidio.

He left a mark on everyone who knew him, through his laughter, his intellect, his boundless energy, and his extraordinary capacity to care.

C1

Roedd ganddo hiwmor anhygoel, argyhoeddiad anhygoel ac egni diderfyn.

He had incredible humour, incredible conviction and boundless energy.

C1

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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