costasach

Irish

Alternative forms

• costaiseach

Etymology

From costas (“cost, expense”) +‎ -ach.

Adjective

costasach (genitive singular masculine costasaigh, genitive singular feminine costasaí, plural costasacha, comparative costasaí)

1. costly, expensive; sumptuous

   Synonyms: costasúil, daor

Declension

Declension of costasach

Positive	singular		plural
	masculine	feminine
nominative	costasach	chostasach	costasacha; chostasacha2
vocative	chostasaigh		costasacha
genitive		costasaí	strong noun	weak noun
			costasacha	costasach
dative	costasach; chostasach1	chostasach; chostasaigh (archaic)	costasacha; chostasacha2
Comparative	níos costasaí
Superlative	is costasaí

¹ When the preceding noun is lenited and governed by the definite article.
² When the preceding noun ends in a slender consonant.

Related terms

• costasúlacht, costasacht (“costliness; sumptuousness”)

Mutation

Mutated forms of costasach

radical	lenition	eclipsis
costasach	chostasach	gcostasach

Note: Certain mutated forms of some words can never occur in standard Modern Irish.
All possible mutated forms are displayed for convenience.

Further reading

• Ó Dónaill, Niall (1977) “costasach”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
• de Bhaldraithe, Tomás (1959) “costasach”, in English-Irish Dictionary, An Gúm
• “costasach”, in New English-Irish Dictionary, Foras na Gaeilge, 2013-2025