im·pugn /ɪmˈpjun/
  (vt.)責難,抨擊,攻擊
  Im·pugn v. t. [imp. & p. p. Impugned p. pr. & vb. n. Impugning.]  To attack by words or arguments; to contradict; to assail; to call in question; to make insinuations against; to gainsay; to oppose; as, to impugn a person's integrity.
     The truth hereof I will not rashly impugn, or overboldly affirm.   --Peacham.
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  impugn
       v : attack as false or wrong