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Adjective: capricious  ku'pri-shus
  1. Determined by chance or impulse or whim rather than by necessity or reason
    "a capricious refusal"; "authoritarian rulers are frequently capricious";
    - impulsive, whimsical, vagarious
     
  2. Changeable
    "a capricious summer breeze";
    - freakish

See also: arbitrary, unpredictable

Encyclopedia: Capricious