whimsy

Words with a similar base: whimsy

'whimsy'

[notion.n.03] as in: an odd or fanciful or capricious idea

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Examples:
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

'whimsy'

[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