Fluid — Meaning, Definition & Synonyms

adjective noun /ˈflü-əd/ flu·id

Meaning & Definition of Fluid

Fluid (adjective)

  1. having particles that easily move and change their relative position without a separation of the mass and that easily yield to pressure, capable of flowing
  2. subject to change or movement
  3. characterized by or employing a smooth easy style

Fluid (noun)

  1. a substance (such as a liquid or gas) tending to flow or conform to the outline of its container

Fluid (adjective) — Senses, Synonyms & Antonyms

  1. capable of moving like a liquid

    "warm the jam until it is fluid, then spread it over the cake"

    similar: flowing, fluent, liquid
    related: circumfluent, circumfluous, diluted, thin, watery, weak, semiliquid, semisolid
    opposite: hard, nonliquid, solid
    near: clotted, coagulated, gelatinous, gelled, jelled, jellied, thick, gluey, glutinous, gooey, gummy, viscous

  2. capable of being readily changed

    "the script is still fluid at this point, so be prepared for last-minute rewrites"

    similar: adaptable, adjustable, alterable, changeable, elastic, flexible, malleable, modifiable, pliable, variable
    related: changing, fluctuating, inconstant, labile, unstable, unsteady, varying, versatile
    opposite: established, fixed, immutable, inelastic, inflexible, invariable, nonmalleable, ramrod, set, unadaptable, unalterable, unbudgeable, unchangeable
    near: constant, stable, steady, unchanging, uniform, unvarying

  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"

    similar: cheap, downhill, easy, effortless, facile, fluent, hands-down, light, painless, ready, royal, simple, smooth, snap, soft
    related: 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
    opposite: arduous, demanding, difficult, exacting, formidable, grueling, hard, herculean, killer, labored, laborious, murderous, rough, severe, stiff, strenuous, toilful, toilsome, tough
    near: burdensome, exhausting, onerous, oppressive, painful, stressful, taxing, troublesome, abstruse, complex, complicated, intricate, involved, knotty, problematic, recondite

  4. likely to change frequently, suddenly, or unexpectedly

    "his arrival plans are fluid, so expect him anytime"

    similar: capricious, changeable, changeful, fickle, flickery, fluctuating, inconsistent, inconstant, mercurial, mutable, skittish, temperamental, uncertain, unpredictable, unsettled, unstable, unsteady, variable, volatile, up in the air
    related: 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
    opposite: certain, changeless, constant, immutable, invariable, predictable, settled, stable, stationary, steady, unchangeable, unchanging, unvarying
    near: equable, even, uniform, abiding, durable, lasting, permanent, persistent, dependable, reliable, sure, tried, tried-and-true, true, trustworthy, trusty

Synonyms, Thesaurus & Another Word for Fluid

The most common words with a similar meaning to Fluid:

flowing, fluent, liquid, adaptable, adjustable, alterable, changeable, elastic, flexible, malleable, modifiable, pliable, variable, cheap, downhill, easy, effortless, facile, hands-down, light, painless, ready, royal, simple, smooth, snap, soft, capricious, changeful, fickle, flickery, fluctuating, inconsistent, inconstant, mercurial, mutable, skittish, temperamental, uncertain, unpredictable

Antonyms & Opposite Words for Fluid

Words with the opposite meaning of Fluid:

hard, nonliquid, solid, established, fixed, immutable, inelastic, inflexible, invariable, nonmalleable, ramrod, set, unadaptable, unalterable, unbudgeable, unchangeable, arduous, demanding, difficult, exacting, formidable, grueling, herculean, killer, labored, laborious, murderous, rough, severe, stiff

Related Words for Fluid

circumfluent, circumfluous, diluted, thin, watery, weak, semiliquid, semisolid, changing, labile, varying, versatile, idiotproof, mindless, quick, straightforward, unchallenging, uncomplicated, apparent, clear, clear-cut, distinct, evident, manifest, obvious, open-and-shut, palpable, patent, perspicuous, plain

Near Antonyms of Fluid

clotted, coagulated, gelatinous, gelled, jelled, jellied, thick, gluey, glutinous, gooey, gummy, viscous, uniform, burdensome, exhausting, onerous, oppressive, painful, stressful, taxing, troublesome, abstruse, complex, complicated, intricate, involved, knotty, problematic, recondite, equable

Word Forms of Fluid

Derived words: fluidly (adverb), fluidness (noun), fluidal (adjective), fluidally (adverb), fluidlike (adjective)

Origin & Etymology of Fluid

French or Latin; French fluide, from Latin fluidus, from fluere to flow; akin to Greek phlyzein to boil over

First known use: 1603

Vocabulary Lists & Topics for Fluid

Words & Phrases Containing Fluid

fluid dram, fluid mechanics, fluid ounce, amniotic fluid, cerebrospinal fluid, correction fluid, drilling fluid, gender-fluid

Frequently Asked Questions about Fluid

What does "Fluid" mean?

"Fluid" means having particles that easily move and change their relative position without a separation of the mass and that easily yield to pressure, capable of flowing. As an an adjective and a noun, it is defined as: having particles that easily move and change their relative position without a separation of the mass and that easily yield to pressure, capable of flowing. It has 4 distinct senses.

What is another word for "Fluid"?

Other words for "Fluid" include flowing, fluent, liquid, adaptable, adjustable, alterable, changeable and elastic. The best synonym depends on which meaning of "Fluid" you intend.

What are different ways to say "Fluid"?

There are 103 words and phrases with a similar meaning to "Fluid". Common alternatives include flowing, fluent, liquid, adaptable, adjustable, alterable, changeable, elastic, flexible and malleable.

What is the opposite of "Fluid"?

Antonyms of "Fluid" include hard, nonliquid, solid, established, fixed, immutable, inelastic and inflexible. Near antonyms include clotted, coagulated, gelatinous and gelled.

How do you use "Fluid" in a sentence?

Examples of "Fluid" in a sentence: "warm the jam until it is fluid, then spread it over the cake"; "the script is still fluid at this point, so be prepared for last-minute rewrites"; "the dance looked smooth and fluid, though backstage we could see the dancer gasping for breath and sweating from the effort".

Is "Fluid" a noun, verb, or adjective?

"Fluid" can be used as an adjective and a noun, depending on the context.

Is "Fluid" useful for IELTS, TOEFL, and other English exams?

As a C1-level word, "Fluid" is typical of Cambridge C1 Advanced (CAE), IELTS band 7.0–8.0, TOEFL iBT 95–113, PTE Academic 76–84, TOEIC Listening & Reading 945+. Advanced words like this are also useful for the GRE, SAT, GMAT, and LSAT.

How do you pronounce "Fluid"?

"Fluid" is pronounced /ˈflü-əd/ and divided into syllables as flu·id.