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Use "whimsicalness" in a sentence
"“But still one can see signs of caprice and a certain whimsicalness and irritability.”"
"Elizabeth lost faith in herself as she saw her apparent whimsicalness and began to lash herself into line as John and his mother wished."
"I could not help thinking of the whimsicalness of chance, which had seen fit to make me the solitary companion of a woman of whose existence I knew nothing a few hours before."