fluctuating

1 likely to change frequently, suddenly, or unexpectedly a fluctuating stock market makes it hard for investors to know what to do Synonyms capricious, changeable, changeful, flickery, fickle, 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 not staying constant our speed was constantly fluctuating, so the figure of 50 miles per hour is just an average Synonyms changing, erratic, uneven, irregular, unequal, unstable, unsteady, varyingRelated Words capricious, changeable, changeful, choppy, fickle, fluid, inconsistent, inconstant, mercurial, mutable, uncertain, unsettled, variable, volatileNear Antonyms regularAntonyms changeless, constant, stable, steady, unchanging, unvarying