capriceEnglishOxford American Thesauruscaprice noun 1 the caprices of the electorate: whim, whimsy, vagary, fancy, notion, fad, freak, humor, impulse, quirk, eccentricity, foible, crotchet, urge. 2 the staff tired of his tyranny and his caprice: fickleness, changeableness, volatility, inconstancy, capriciousness, fitfulness, unpredictability. ▷antonyms stability.