rattlebrained
  (a.)頭腦空虛的,愚蠢多嘴的
  rattlebrained
       adj : lacking sense or discretion; "his rattlebrained crackpot
             ideas"; "how rattlepated I am! I've forgotten what I
             came for"- Glenway Westcott [syn: rattlepated, scatterbrained,
              scatty]