capricious

1 likely to change frequently, suddenly, or unexpectedly capricious weather that was balmy one day and freezing cold the next Synonyms fickle, changeable, changeful, flickery, fluctuating, fluid, inconsistent, inconstant, mercurial, mutable, skittish, temperamental, uncertain, unpredictable, unsettled, unstable, unsteady, variable, volatileRelated Words aimless, arbitrary, desultory, erratic, haphazard, hit-or-miss, irregular, random, scattered, slapdash, stray; ambivalent, hesitating, shaky, shilly-shally, shilly-shallying, vacillating, wavering; dicey, undependable, unreliable, untrustworthy; adaptable, mobile, protean, versatileNear Antonyms equable, even, uniform; abiding, durable, lasting, permanent, persistent; dependable, reliable, sure, tried, tried-and-true, true, trustworthy, trustyAntonyms certain, changeless, constant, immutable, invariable, predictable, settled, stable, stationary, steady, unchangeable, unchanging, unvarying

2 prone to sudden illogical changes of mind, ideas, or actions a capricious woman who changed her mind dozens of times about what color to paint the bathroom Synonyms whimsical, freakish, impulsiveRelated Words impetuous, mercurial, moody, temperamental, volatile; crankish, eccentric, flaky, quirky; arbitrary, erratic, fickle, inconstant, irregular, shaky, willful (or wilful); impractical, quixotic, quixotical, romantic, unrealistic, utopian, visionaryNear Antonyms equable; down-to-earth, earthy, hard-boiled, hardheaded, levelheaded, matter-of-fact, practical, pragmatic (also pragmatical), reasonable, sensible, tough-minded; commonsensical, grounded, logical, no-nonsense, rational, sane, sober, sobersided, sound; fast, fixed, hard-and-fast, immutable, inflexible, invariable, unalterable, unbending, unchangeable uncompromising, unrelenting, unyielding; changeless, constant, established, set, settled, stable, steadfast, steady, unchanging, unvarying