Source : Webster's Revised Unabridged Dictionary (1913)

Whimsical \Whim"si*cal\, a. [From {Whimsey}.]
   1. Full of, or characterized by, whims; actuated by a whim;
      having peculiar notions; queer; strange; freakish. ``A
      whimsical insult.'' --Macaulay.

            My neighbors call me whimsical.       --Addison.

   2. Odd or fantastic in appearance; quaintly devised;
      fantastic. ``A whimsical chair.'' --Evelyn.

   Syn: Quaint; capricious; fanciful; fantastic.

Source : WordNet®

whimsical
     adj : 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: {capricious}, {impulsive}]