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Expensive in Irish (costasach): Meaning, Forms, Examples

Other uses of ‘costasach’: sumptuous

The Irish for expensive is costasach: carr costasach, an expensive car.
Updated October 2026Report a mistake

How to say “expensive” in Irish

Irish:
costasach
English:
expensive, sumptuous
Word type:
adjective
More expensive:
níos costasaí
Most expensive:
is costasaí
Plural:
costasacha
Pronunciation:
“KUS-tuss-ukh”  /ˈkɔst̪ˠəsˠəx/

What does “costasach” mean?

“Costasach” has two alternative meanings. The most common comes first.

expensive
Costing a lot of money.Also: costly, dear, pricey.
1 other meaning: sumptuous
2sumptuous
Lavish and extravagant, involving great expense.Also: lavish, extravagant.

Other Irish adjectives for expensive: daor (expensive)

“Costasach” after a noun

An Irish adjective comes after its noun. Here is costasach after carr (car, masculine), after bróg (shoe, feminine) and after a plural.

after a masculine nouncarr costasachan expensive car
after a feminine nounbróg chostasachan expensive shoe
after a plural nouncarranna costasachaexpensive cars

séimhiú (the h) the ending

feminine
brógshoe
+
costasachexpensive
=
bróg chostasachan expensive shoe

After a feminine noun the adjective gets a séimhiú, an h after its first letter: bróg chostasach. After a masculine noun it stays as it is: carr costasach.

plural
carrannacars
+
costasachaexpensive, plural
=
carranna costasachaexpensive cars

With a plural noun the adjective takes its plural form, costasacha. It also gets an h after a plural that ends in a slender consonant; after other plurals it does not: bróga costasacha.

More expensive, most expensive, very expensive

níosmore
+
costasaíexpensive
=
níos costasaímore expensive
ismost
+
costasaíexpensive
=
is costasaímost expensive

Tá an t-óstán seo níos costasaí ná an ceann eile. This hotel is more expensive than the other one.

more expensiveníos costasaíin the past tense: ní ba chostasaí
most expensiveis costasaíin the past tense: ba chostasaí
as expensive aschomh costasach leno change after chomh
very expensivean-chostasachan- lenites, except d, t and s
too expensiveróchostasachró- lenites

“Costasach” in a sentence: Irish examples

With a masculine noun, a feminine noun, a plural, a comparison and on its own.

Cheannaigh sé carr costasach inné.
He bought an expensive car yesterday.
Cheannaigh sí bróga costasacha inné.
She bought expensive shoes yesterday.
Ní maith liom na bialanna costasacha sin.
I don't like those expensive restaurants.
Tá an t-óstán seo níos costasaí ná an ceann eile.
This hotel is more expensive than the other one.
Tá sé seo cuibheasach costasach.
This is fairly expensive.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Expensive in Irish: frequently asked questions

What is the Irish for expensive?

The Irish for expensive is costasach (pronounced “KUS-tuss-ukh”). It comes after the noun: carr costasach, an expensive car; bróg chostasach, an expensive shoe.

How do you say more expensive and most expensive in Irish?

níos costasaí is more expensive and is costasaí is most expensive. In the past tense they become ní ba chostasaí and ba chostasaí.

Why does costasach become chostasach?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So bróg chostasach (an expensive shoe) but carr costasach (an expensive car), because carr is masculine.

What is the plural of costasach?

With a plural noun costasach becomes costasacha: carranna costasacha, bróga costasacha.

How do you say very expensive in Irish?

an-chostasach. Too expensive is róchostasach, and as expensive as is chomh costasach le.

Does costasach have more than one meaning?

Yes. Costasach can mean expensive or sumptuous, depending on context; the first is the most common.

What is the difference between costasach and daor?

Both mean expensive; daor is the more everyday word (Tá sé daor), while costasach suggests something that involves great cost or expense.

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