ainéifeacht

== Irish == === Etymology === From ain- (“in-, un-, not”, negative prefix) +‎ éifeacht (“efficacy, effect”). === Noun === ainéifeacht f (genitive singular ainéifeachta) inefficacy ==== Declension ==== ==== Derived terms ==== ainéifeachtach (“ineffective”, adjective) === Mutation === === References === Ó Dónaill, Niall (1977), “ainéifeacht”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN