Caprice refers to a sudden change in someone's behavior or decision, often without any logical reason. It can also mean an unpredictable or impulsive action. Full definition
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This noble, black ladies sandal from CAPRICE accompanies you fashionably and stylishly through the warm season. (kelkoo.co.uk)
So Niebuhr advised: «If it is not possible for modern man to hold by faith that there is a larger meaning in the intricate patterns of history than those which his own virtues or skills supply, he would do well to emphasize fortune and caprice in his calculations.» (firstthings.com)