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")
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")
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