A sudden desire (synset 107505719)
"he bought it on an impulse"hypernym: desire - the feeling that accompanies an unsatisfied state
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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