Whimsical means full of or characterized by whims, which are odd ideas that usually occur to you very suddenly. If you decide at the last minute to fly to Europe, you could say you went there on a whim.

Whimsical can also mean tending toward odd or unpredictable behavior. Both whimsical and whim are derived from an earlier English word whim-wham, which is of unknown origin. Whim-wham had about the same meaning as whim, but could also refer to an odd object or piece of clothing.

Definitions of whimsical
  1. adjective
    determined by chance or impulse or whim rather than by necessity or reason
    “the victim of whimsical persecutions”
    synonyms: capricious, impulsive
    based on or subject to individual discretion or preference or sometimes impulse or caprice
  2. adjective
    indulging in or influenced by fancy
    synonyms: fanciful, notional
    creative, originative
    having the ability or power to create
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