scatterbrained

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}, {scatterbrained}, {scatty}]
    2: guided by whim and fancy; "flighty young girls" [syn:
       {flighty}, {flyaway}, {head-in-the-clouds}, {scatterbrained}]
    

Scatter-brained \Scat"ter-brained`\, a.
   Giddy; thoughtless.
   [1913 Webster]
    

Shatter-brained \Shat"ter-brained`\, Shatter-pated
\Shat"ter-pat`ed\, a.
   Disordered or wandering in intellect; hence, heedless; wild;
   similar to {scatter-brained}. --J. Goodman.
   [1913 Webster +PJC]
    

107 Moby Thesaurus words for "scatterbrained":
      adrift, afloat, alternating, amorphous, blank, brainless,
      capricious, changeable, changeful, dazed, desultory, deviable,
      dippy, dizzy, dopey, eccentric, empty, empty-headed, empty-minded,
      empty-pated, empty-skulled, erratic, fast and loose,
      featherbrained, featherheaded, fickle, fitful, flibbertigibbet,
      flickering, flighty, flitting, fluctuating, fluttery, freakish,
      frivolous, gaga, giddy, giddy-brained, giddy-headed, giddy-pated,
      giddy-witted, harebrain, harebrained, hollow, impetuous, impulsive,
      inane, inconsistent, inconstant, indecisive, infirm, irregular,
      irresolute, irresponsible, jejune, mazy, mercurial, moody,
      rambling, rattlebrained, rattleheaded, rattlepated, restless,
      roving, scramblebrained, shapeless, shatterbrained, shifting,
      shifty, shuffling, silly, spasmodic, spineless, thoughtless,
      unaccountable, uncertain, uncontrolled, undependable,
      undisciplined, unfixed, unpredictable, unreliable, unrestrained,
      unsettled, unstable, unstable as water, unstaid, unsteadfast,
      unsteady, vacant, vacillating, vacuous, vagrant, vapid, variable,
      vicissitudinary, vicissitudinous, volatile, wandering, wanton,
      wavering, wavery, wavy, wayward, whimsical, wishy-washy, witless