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deddfu

to legislate

VerbC2/ˈdɛðvɨ/

"deddfu" means "to legislate" in Welsh (verb). Pronounced /ˈdɛðvɨ/. Mutation forms: Treiglad Meddal → ddeddfu, Treiglad Trwynol → neddfu.

Mutation forms

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

MutationForm
Base formdeddfu
Treiglad Meddalddeddfu
Treiglad Trwynolneddfu

"deddfu" in context

Rydych chi'n deddfu ar fysiau ac rydych chi'n gwneud dim am drafnidiaeth ysgol.

You're legislating on buses and you're doing nothing about school transport.

B2

Hynny yw, mae angen deddfu.

In other words, we need to legislate.

A2

Byddai'r gwelliant yn gofyn bod canllawiau ar waith cyn deddfu, ond mae'r deddfu yn digwydd ar adeg cael Cydsyniad Brenhinol.

The amendment would require guidance to be in place before enactment, but enactment occurs on Royal Assent.

C2

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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