fa·tu·ity /fəˈtuəti, fæ, ˈʧu, ˈtju-/
  愚鈍,昏庸,愚蠢的言行
  Fa·tu·i·ty n.  Weakness or imbecility of mind; stupidity.
     Those many forms of popular fatuity.   --I Taylor.
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  fatuity
       n : a ludicrous folly; "the crowd laughed at the absurdity of
           the clown's behavior" [syn: absurdity, fatuousness, silliness]