pow·er·less /-ləs/
  (a.)無力的,無權的,無效能的
  Pow·er·less, a. Destitute of power, force, or energy; weak; impotent; not able to produce any effect. -- Pow*er*less*ly, adv. -- Pow*er*less*ness, n.
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  powerless
       adj : lacking power [syn: weak] [ant: powerful]