† deˈfaillancyObs.rare. [f. as prec. with suffix -ancy.] Failure. 1649Jer. Taylor Gt. Exemp. ii. viii. 71 Our life is full of defaillancies.1689Def. Liberty agst. Tyrants 144 Neither can the others defaillancy [printed defalliancy] be excused, in the bad managing of the tutorship.