"whim" in the noun sense
1. caprice, impulse, whim
a sudden desire
"he bought it on an impulse"
2. 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"
Source: WordNet® (An amazing lexical database of English)
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