im·be·cile /ˈɪmbəsəl, ˌsɪl/
  (a.)低能的,愚鈍的,虛弱的低能者,痴呆,愚蠢者
  im·be·cile /ˈɪmbəsəl, ˌsɪl/ 名詞
  低能兒,癡愚者
  Im·be·cile a.  Destitute of strength, whether of body or mind; feeble; impotent; esp., mentally wea; feeble-minded; as, hospitals for the imbecile and insane.
  Syn: -- Weak; feeble; feeble-minded; idiotic.
  Im·be·cile, n.
  1. One destitute of strength; esp., one of feeble mind; -- sometimes used as a pejorative term.
  Im·be·cile, v. t. To weaken; to make imbecile; as, to imbecile men's courage. [Obs.]
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  imbecile
       adj : having a mental age of three to seven years [syn: imbecilic,
              idiotic]
       n : a person of subnormal intelligence [syn: idiot, cretin,
           moron, changeling, half-wit, retard]