éifeachtach

Irish

Etymology

From Old Irish éifechtach (“effective, efficacious, efficient; weighty, important”). By surface analysis, éifeacht (“force, significance; efficacy, effect; value, importance; sense, substance; achievement, success”) +‎ -ach.

Adjective

éifeachtach (genitive singular masculine éifeachtaigh, genitive singular feminine éifeachtaí, plural éifeachtacha, comparative éifeachtaí)

1. forceful, significant; efficacious, effective; important
2. great, powerful; highly capable

Declension

Declension of éifeachtach

	Singular		Plural (m/f)
Positive	Masculine	Feminine	(strong noun)	(weak noun)
Nominative	éifeachtach	éifeachtach	éifeachtacha
Vocative	éifeachtaigh		éifeachtacha
Genitive		éifeachtaí	éifeachtacha	éifeachtach
Dative	éifeachtach	éifeachtach; éifeachtaigh (archaic)	éifeachtacha
Comparative	níos éifeachtaí
Superlative	is éifeachtaí

Derived terms

• ainéifeachtach (“ineffective”, adjective)
• neamhéifeachtach (“ineffective; inefficient”, adjective)

Mutation

Irish mutation
Radical	Eclipsis	with h-prothesis	with t-prothesis
éifeachtach	n-éifeachtach	héifeachtach	not applicable
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

References

• Ó Dónaill, Niall (1977) “éifeachtach”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
• Gregory Toner, Sharon Arbuthnot, Máire Ní Mhaonaigh, Marie-Luise Theuerkauf, Dagmar Wodtko, editors (2019), “éifechtach”, in eDIL: Electronic Dictionary of the Irish Language