"whimsicality" in the noun sense
1. 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"
2. impishness, mischievousness, puckishness, whimsicality
the trait of behaving like an imp
Source: WordNet® (An amazing lexical database of English)
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