[215] in-efficāx, cācis, unfähig, etw. hervorzubringen, vox ineff. verborum, Sen. de ira 1, 3, 7. – dah. unwirksam, schwach, ratio, Sen.: furoris exitus, Ambros.: genus animalium ineff. bello est, Veget. mil.: constat inefficax machinamentum reddi, si inveniatur inferius, ibid. – Compar., fit ex candido aero squama longe Cypriā inefficacior, Plin. 34, 109.