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castio

to prank

VerbC2/ˈkastjɔ/

"castio" means "to prank" in Welsh (verb). Pronounced /ˈkastjɔ/. Mutation forms: Treiglad Meddal → gastio, Treiglad Trwynol → nghastio, Treiglad Llaes → chastio.

Mutation forms

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

MutationForm
Base formcastio
Treiglad Meddalgastio
Treiglad Trwynolnghastio
Treiglad Llaeschastio

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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