(noun) the quality of being guided by sudden unpredictable impulses. Synonyms: unpredictability.
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Noun Definition 1
(noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment. Synonyms: flightiness, arbitrariness, whimsicality, whimsy, whimsey. Example: "I despair at the flightiness and whimsicality of my memory."