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"
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"
Whimsy is behaviour which is unusual, playful, and unpredictable, rather than having any serious reason or purpose behind it. a way of thinking, behaving, or doing something that is unusual, strange, and often amusing (whim-wham; WHIM)