Noun

• S: (n) notion, whim, whimsy, whimsey (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"
• S: (n) flightiness, arbitrariness, whimsicality, whimsy, whimsey, capriciousness (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"