無用,無益,無價值
Futility \Fu"til`i*ty\, n. [L. futilitas: cf. F. futilit['e].] 1. The quality of being talkative; talkativeness; loquaciousness; loquacity. [Obs.] 2. The quality of producing no valuable effect, or of coming to nothing; uselessness. The futility of this mode of philosophizing. --Whewell.
futility n : uselessness as a consequence of having no practical result