Etymology
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whimsy (n.)

c. 1600, probably related to whimwham.

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Definitions of whimsy

whimsy (n.)
the trait of acting unpredictably and more from whim or caprice than from reason or judgment;
Synonyms: flightiness / arbitrariness / whimsicality / whimsey / capriciousness
whimsy (n.)
an odd or fanciful or capricious idea;
whimsy can be humorous to someone with time to enjoy it
he had a whimsy about flying to the moon
Synonyms: notion / whim / whimsey
From wordnet.princeton.edu