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Adjective: scatterbrained  'ska-tu(r),breynd
  1. Lacking sense or discretion
    "his scatterbrained crackpot ideas";
    - rattlebrained, rattlepated, scatty [Brit]
     
  2. Guided by whim and fancy
    "scatterbrained young girls";
    - flighty, flyaway, head-in-the-clouds, dippy

See also: daft, dumb, foolish, frivolous, stupid