unable to take effective action; helpless or powerless
无能为力的,无助的;无能的
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he was seized with an impotent anger .他被一种无能为力的怒气攫住了。
(of a man)abnormally unable to achieve an erection or orgasm
(男人)阳痿的。
(of a male animal)unable to copulate
(雄性动物)性无能的。
"late Middle English: via Old French from Latin