An alternate form of capriciousness; the quality of being capricious, unpredictable, or whimsical.
Formed from capriccio + -osity, a suffix meaning the quality or state of. This is a less common variant of 'capriciousness,' reflecting the multiple pathways English uses to create abstract nouns.
This word is so rare that most dictionaries don't list it, but it shows how creative English speakers are—when one word exists, we can usually invent three more with different suffixes.
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