fluid

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adjective

Definition of FLUID

1

capable of moving like a liquid <warm the jam until it is fluid, then spread it over the cake>

Synonyms flowing, fluent, liquid

Related Words circumfluent, circumfluous; diluted, thin, watery, weak; semiliquid, semisolid

Near Antonyms clotted, coagulated, gelatinous, gelled, jelled, jellied, thick; gluey, glutinous, gooey, gummy, viscous

Antonyms hard, nonliquid, solid

2

capable of being readily changed <the script is still fluid at this point, so be prepared for last-minute rewrites>

Synonyms adaptable, adjustable, alterable, changeable, elastic, fluid, malleable, modifiable, pliable, variable

Related Words changing, fluctuating, inconstant, labile, unstable, unsteady, varying, versatile

Near Antonyms constant, stable, steady, unchanging, uniform, unvarying

Antonyms established, fixed, immutable, inelastic, inflexible, invariable, nonmalleable, ramrod, set, unadaptable, unalterable, unbudgeable, unchangeable

3

involving minimal difficulty or effort <the dance looked smooth and fluid, though backstage we could see the dancer gasping for breath and sweating from the effort>

Synonyms cheap, downhill, effortless, facile, fluent, fluid, hands-down, light, painless, ready, royal, simple, smooth, snap, soft

Related Words idiotproof, mindless, quick, straightforward, unchallenging, uncomplicated; apparent, clear, clear-cut, distinct, evident, manifest, obvious, open-and-shut, palpable, patent, perspicuous, plain, transparent, unambiguous, unequivocal, unmistakable

Near Antonyms burdensome, exhausting, onerous, oppressive, painful, stressful, taxing, troublesome; abstruse, complex, complicated, intricate, involved, knotty, problematic (also problematical), recondite

Antonyms arduous, demanding, difficult, exacting, formidable, grueling (or gruelling), hard, herculean, killer, labored, laborious, murderous, rough, severe, stiff, strenuous, toilful, toilsome, tough

4

likely to change frequently, suddenly, or unexpectedly <his arrival plans are fluid, so expect him anytime>

Synonyms capricious, changeable, changeful, flickery, fluctuating, fluid, inconsistent, inconstant, mercurial, mutable, skittish, temperamental, uncertain, unpredictable, unsettled, unstable, unsteady, variable, volatile

Related 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, versatile

Near Antonyms equable, even, uniform; abiding, durable, lasting, permanent, persistent; dependable, reliable, sure, tried, tried-and-true, true, trustworthy, trusty

Antonyms certain, changeless, constant, immutable, invariable, predictable, settled, stable, stationary, steady, unchangeable, unchanging, unvarying