whimsicality

Words with a similar base: whimsicality

'whimsicality'

[flightiness.n.01] as in: the trait of acting unpredictably and more from whim or caprice than from reason or judgment

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Examples:
I despair at the flightiness and whimsicality of my memory

'whimsicality'

[impishness.n.01] as in: the trait of behaving like an imp