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

   Synonym: costasúil

Declension

Declension of costasach

	Singular		Plural (m/f)
Positive	Masculine	Feminine	(strong noun)	(weak noun)
Nominative	costasach	chostasach	costasacha; chostasacha²
Vocative	chostasaigh		costasacha
Genitive		costasaí	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

Irish mutation
Radical	Lenition	Eclipsis
costasach	chostasach	gcostasach
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

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, 2013-2024