資料來源 : pyDict

無益的,無用的,無效的,徒勞的

資料來源 : WordNet®

unavailing
     adj : producing no result or effect; "a futile effort"; "the
           therapy was ineffectual"; "an otiose undertaking"; "an
           unavailing attempt" [syn: {futile}, {ineffectual}, {otiose}]