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costasach

costly

AdjectiveC1

"costasach" means "costly" in Irish (adjective). Mutation forms: Séimhiú → chostasach, Urú → gcostasach.

Mutation forms

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

MutationForm
Base formcostasach
Séimhiúchostasach
Urúgcostasach

"costasach" in context

Tá sé seo cuibheasach costasach.

This is fairly expensive.

B1

Further reading

Irish Mutations: Complete Guide to Séimhiú and Urú →Irish Pronunciation, The System Behind the Spelling →How to Learn Irish as an Adult, A Step-by-Step Roadmap →Best Irish Learning App 2026 →Browse all Irish vocabulary →

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Related Irish words

saor

cheap

mór

big

úr

free

cáiliúil

famous

sibhialta

civil

gairmiúil

vocational

infheidhme

fit

díobhálach

harmful

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