Scat·ter-brained a. Giddy; thoughtless.
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  scatterbrained
       adj 1: lacking sense or discretion; "his rattlebrained crackpot
              ideas"; "how rattlepated I am! I've forgotten what I
              came for"- Glenway Westcott [syn: rattlebrained, rattlepated,
               scatty]
       2: absent-mindedly irresponsible; "he said I was too flighty to
          be a good supervisor" [syn: flighty, head-in-the-clouds]