An odd or fanciful or capricious idea "he had a whimsy about flying to the moon"; "whimsy can be humorous to someone with time to enjoy it" - notion, whim, whimsey
The trait of acting unpredictably and more from whim or caprice than from reason or judgment - flightiness, arbitrariness, whimsicality, whimsey, capriciousness
Derived forms: whimsies
See also: whimsical
Type of: idea, irresponsibility, irresponsibleness, thought