Source : WordNet®

whimsy
     n 1: an odd or fanciful or capricious idea; "the theatrical
          notion of disguise is associated with disaster in his
          stories"; "he had a whimsy about flying to the moon";
          "whimsy can be humorous to someone with time to enjoy
          it" [syn: {notion}, {whim}, {whimsey}]
     2: the trait of acting unpredictably and more from whim or
        caprice than from reason or judgment; "I despair at the
        flightiness and whimsicality of my memory" [syn: {flightiness},
         {arbitrariness}, {whimsicality}, {whimsey}, {capriciousness}]
     [also: {whimsiest}, {whimsier}]

whimsier
     See {whimsy}