Source : Webster's Revised Unabridged Dictionary (1913)

Capricious \Ca*pri"cious\, a. [Cf. F. capricleux, It.
   capriccioso.]
   Governed or characterized by caprice; apt to change suddenly;
   freakish; whimsical; changeable. ``Capricious poet.'' --Shak.
   ``Capricious humor.'' --Hugh Miller.

         A capricious partiality to the Romish practices.
                                                  --Hallam.

   Syn: Freakish; whimsical; fanciful; fickle; crotchety;
        fitful; wayward; changeable; unsteady; uncertain;
        inconstant; arbitrary. -- {Ca*pri"cious*ly}, adv. --
        {Ca*pri"cious*ness}, n.

Source : WordNet®

capricious
     adj 1: changeable; "a capricious summer breeze"; "freakish weather"
            [syn: {freakish}]
     2: determined by chance or impulse or whim rather than by
        necessity or reason; "a capricious refusal";
        "authoritarian rulers are frequently capricious"; "the
        victim of whimsical persecutions" [syn: {impulsive}, {whimsical}]