im·po·ten·cy /-tən(t)si/
  無力;無能;虛弱;陽萎
  im·po·ten·cy /-ənsɪ/ 名詞
  陽痿,無能力
  Im·po·tence Im·po·ten·cy n.
  1. The quality or condition of being impotent; lack of strength or power, animal, intellectual, or moral; weakness; feebleness; inability; imbecility.
     Some were poor by impotency of nature; as young fatherless children, old decrepit persons, idiots, and cripples.   --Hayward.
     O, impotence of mind in body strong!   --Milton.
  2. Lack of self-restraint or self-control. [R.]
  3. Law & Med. Lack of procreative power; inability to copulate, or beget children; also, sometimes, sterility; barrenness; specifically, in males: the inability to achieve or sustain a penile erection; erectile dysfunction.
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  impotency
       n 1: the quality of lacking strength or power; being weak and
            feeble [syn: powerlessness, impotence] [ant: power,
             power]
       2: an inability (usually of a male) to copulate [syn: impotence]