1. [ noun ] the quality of being guided by sudden unpredictable impulses
Synonyms: unpredictability
Related terms: inconstancy
2. [ noun ] the trait of acting unpredictably and more from whim or caprice than from reason or judgment
Synonyms: arbitrariness whimsicality whimsy whimsey flightiness

"I despair at the flightiness and whimsicality of my memory"

Related terms: irresponsibility
Similar spelling:   capriciously