whim

Noun
  1. A sudden desire (synset 107505719)
    "he bought it on an impulse"
  2. An odd or fanciful or capricious idea (synset 105928143)
    "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"

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