whimsy

Meanings

• 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"
• the trait of acting unpredictably and more from whim or caprice than from reason or judgment

Synonyms

arbitrariness, capriciousness, flightiness, notion, whim, whimsey, whimsicality