vain, a.1(Of hope, etc.) Baoth, díomhaoin. Vain promises, gealltanais mpl gan cur leo. 2Gan éifeacht, in aisce. Vain efforts, saothar m in aisce. It is vain for you to try, saothar in aisce agat féachaint leis. 3Díomasach, leitheadach, uallach. She is vain of her beauty, tá sí mór as a háilleacht. 4In vain, in aisce. aWe protested in vain, it was in vain that we protested, chuireamar ina aghaidh ach ní raibh gar ann. He laboured in vain, bhí a shaothar in aisce aige. bTo take God's name in vain, ainm Dé a thabhairt gan fáth. ►vainly, adv.1In aisce; go baoth, go díomhaoin.2 Go díomasach, etc.