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deall

to understand

VerbB1/ˈdeː.aɬ/

"deall" means "to understand" in Welsh (verb). Pronounced /ˈdeː.aɬ/. Mutation forms: Treiglad Meddal → ddeall, Treiglad Trwynol → neall.

Mutation forms

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

MutationForm
Base formdeall
Treiglad Meddalddeall
Treiglad Trwynolneall

When does "deall" mutate?

er mwyn— in order to / for the sake of (compound preposition, triggers treiglad meddal)

deall→er mwyn ddeall(in order to understand)

"deall" in context

Dw i'n gallu deall dy iaith di.

I can understand your language.

A1

Dydy Tom ddim yn deall Ffrangeg.

Tom doesn't understand French.

C1

Ydy'r ddau ohonynt yn deall Siapaneg?

Do they both understand Japanese?

B2

Dw i ddim yn deall.

I don't understand.

A2

Dw i’n deall Cymraeg ond dw i ddim yn medru ei siarad.

I understand Welsh, but I can't speak it.

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

cofio

to remember

bod

to be

cael

to get

gweld

to see

meddwl

to think (also: to mean)

gwybod

to know

ystyried

to consider

golygu

to view

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