fat·u·ous /ˈfæʧuəs, tju-/
  (a.)發獃的,愚笨的,自滿的
  Fat·u·ous a.
  1. Feeble in mind; weak; silly; stupid; foolish; fatuitous.
  2. Without reality; illusory, like the ignis fatuus.
     Thence fatuous fires and meteors take their birth.   --Danham.
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  fatuous
       adj : complacently or inanely foolish [syn: asinine, inane, mindless,
              vacuous]