Thesaurus

fast

adjective

Synonyms and Antonyms of fast

  1. 1 moving, proceeding, or acting with great speed the fast pace of construction resulted in our new house being done ahead of schedule Synonyms of fast blistering, breakneck, breathless, brisk, dizzy, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy Words Related to fast expeditious, prompt, ready; accelerated, hastened, hurried, quickened, rushed; breathtaking; energetic, strenuous, strong, vigorous; high-speed; rush; ultrafast, ultrarapid Phrases at speed [chiefly British] Near Antonyms of fast crawling, dallying, dawdling, dillydallying, dragging, laggard, languid, lingering, plodding, poking, poky (or pokey), slowish, sluggish, unhurried; deliberate, leisurely, measured; dilatory, late, tardy; ultraslow Antonyms of fast slow

  2. 2 firm in one's allegiance to someone or something the two girls soon became fast and inseparable friends Synonyms of fast constant, dedicated, devoted, devout, down-the-line, faithful, good, loyal, pious, staunch (also stanch), steadfast, steady, true, true-blueWords Related to fast dependable, dutiful, reliable, responsible, solid, tried, tried-and-true, trustworthy, trusty; unfaltering, unhesitating, unwavering; determined, intent, resolute; confirmed, dyed-in-the-wool, inveterate, sworn; ardent, avid, enthusiastic, fervent, fervid, gung ho, impassioned, passionate, seriousNear Antonyms of fast irresponsible, undependable, unreliable, untrustworthy; faltering, hesitant, vacillating, wavering; dubious, irresolute, shaky, uncertain; apathetic, dispassionate, uninterestedAntonyms of fast disloyal, faithless, false, fickle, inconstant, perfidious, recreant, traitorous, treacherous, unfaithful, untrue

  3. 3 firmly positioned in place and difficult to dislodge the rusty, old screws are so fast in the fitting that there's no hope of getting them out Synonyms of fast tight, firm, frozen, jammed, lodged, set, snug, stuck, wedgedWords Related to fast bonded, cemented, glued; anchored, clamped; embedded (also imbedded), entrenched (also intrenched), impacted, implanted; attached, bound, fastened, secured; immovable, unyieldingNear Antonyms of fast detached, dislodged, freed, loosened, unattached, unbound, undone, unfastened, unsecured; movable (or moveable), yieldingAntonyms of fast insecure, loose

  4. 4 given to or marked by cheating and deception rolling back odometers was just one of the fast practices that the used-car dealer was guilty of Synonyms of fast bent [chiefly British], crooked, deceptive, double-dealing, duplicitous, dishonest, fraudulent, guileful, rogue, shady, sharp, shifty, underhand, underhandedWords Related to fast unconscionable, unethical, unprincipled, unscrupulous; deceitful, deceiving, deluding, delusive, delusory, false; artful, beguiling, cagey (also cagy), crafty, cunning, foxy, slick, sly, subtle, wily; defrauding, devious, furtive, slippery, sneaking, sneaky, trickish, tricky; insidious, perfidious, treacherousNear Antonyms of fast conscientious, decent, ethical, honorable, just, scrupulous, upright; forthright, straightforwardAntonyms of fast aboveboard, honest, straight

  5. 5 marked by the ability to withstand stress without structural damage or distortion as the storm approached, we checked to see that every thing on the outside of the house was fast and locked in position Synonyms of fast bombproof, stable, firm, sound, stalwart, strong, sturdyWords Related to fast dependable, durable, reliable; infrangible, irrefragable, unbreakable; beefy, solid; cohesive, toughNear Antonyms of fast infirm, insecure, weak; shaky, tottering, tottery, unbalanced, wobbly (also wabbly); unsubstantialAntonyms of fast rickety, unsound, unstable, unsteady

  6. 6 not lasting for a considerable time after a fast explanation of the procedure, we were turned loose to do the work Synonyms of fast brief, short, littleWords Related to fast shortish; abbreviated, abridged, curtailed, cut-back, shortened, syncopated; compact, condensed; abrupt, sudden; ephemeral, fleeting, momentary, short-lived, transient, transitory; impermanent; compendious, concise, crisp, epigrammatic, laconic, pithy, succinct, summary, terse; short-range, short-termNear Antonyms of fast endless, everlasting, interminable, persistent, unending; longish, overlong, prolonged, protracted; permanent; enlarged, expanded, supplemented; long-range, long-termAntonyms of fast extended, far, great, lengthy, long, long-drawn-out (or long-drawn), long-lived

  7. 7 having or showing quickness of mind I don't know how to operate this machine, but I'm a fast learner Synonyms of fast alert, brainy, bright, brilliant, clever, exceptional, intelligent, hyperintelligent, keen, nimble, quick, quick-witted, sharp, sharp-witted, smart, supersmart, ultrasmartWords Related to fast apt, ingenious, resourceful; acute, astute, discerning, heady, insightful, knowing, perceptive, percipient, perspicacious, sagacious, sapient, savvy, wise; cerebral, erudite, genial, highbrow, knowledgeable, learned, literate, scholarly, well-read; educated, informed, schooled, skilled, trained; creative, inventive, judicious, prudent, sage, sane, sapient, sensible, sound, wise; crafty, cunning, foxy, shrewd, wily; logical, rational, reasonableNear Antonyms of fast feebleminded, simpleminded; boobish, foolish, half-baked, idiotic (also idiotical), imbecile (or imbecilic), moronic, silly; ignorant, illiterate, lowbrow, nonintellectual, unacademic, uneducated, uninformed, unintellectual, untaught, unthinking; absurd, asinine, balmy, cockeyed, crackpot, crazy, cuckoo, daffy, daft, dippy, dotty, featherheaded, fool, half-baked, harebrained, insane, kooky (also kookie), loony (also looney), lunatic, mad, nonsensical, nutty, preposterous, sappy, screwball, tomfool, unwise, wacky (also whacky), zanyAntonyms of fast airheaded, birdbrained, boneheaded, brain-dead, brainless, bubbleheaded, chuckleheaded, dense, dim, dim-witted, doltish, dopey (also dopy), dorky [slang], dull, dumb, dunderheaded, empty-headed, fatuous, gormless [chiefly British], half-witted, knuckleheaded, lamebrain (or lamebrained), lunkheaded, mindless, obtuse, opaque, pinheaded, senseless, simple, slow, slow-witted, soft, softheaded, stupid, thick, thickheaded, thick-witted, unbrilliant, unintelligent, unsmart, vacuous, weak-minded, witless

Synonym Discussion of fast

fast, rapid, swift, fleet, quick, speedy, hasty, expeditious mean moving, proceeding, or acting with celerity. fast and rapid are very close in meaning, but fast applies particularly to the thing that moves
    • fast horses
and rapid to the movement itself.
    • rapid current
swift suggests great rapidity coupled with ease of movement.
    • returned the ball with one swift stroke
fleet adds the implication of lightness and nimbleness.
    • fleet runners
quick suggests promptness and the taking of little time.
    • a quick wit
speedy implies quickness of successful accomplishment
    • speedy delivery of mail
and may also suggest unusual velocity. hasty suggests hurry and precipitousness and often connotes carelessness.
    • a hasty inspection
expeditious suggests efficiency together with rapidity of accomplishment.
    • the expeditious handling of an order

fast

adverb

Synonyms and Antonyms of fast

  1. 1 with great speed run as fast as you can to get help Synonyms of fast apace, briskly, chop-chop, double-quick, fleetly, full tilt, hastily, hell-for-leather, hot, lickety-split, posthaste, presto, pronto, quick, quickly, rapidly, snappily, soon, speedily, swift, swiftly Words Related to fast immediately, promptly, readily; impetuously, impulsively, rashly, recklessly; abruptly, suddenly; energetically, vigorously Phrases a mile a minute, at full throttle, at full tilt, by leaps and bounds, in a hurry, in short order, like a shot, like gangbusters, like wildfire Near Antonyms of fast laggardly, lingeringly, ploddingly, sluggishly; deliberately, leisurely; belatedly, delinquently, tardily Antonyms of fast slow, slowly

  2. 2 to a full extent or degree everyone in camp was fast asleep within minutes of hitting the sack Synonyms of fast all, all of, all over, altogether, clean, completely, dead, enough, entire, entirely, even, exactly, fully, flat, full, heartily, out, perfectly, plumb [chiefly dialect], quite, soundly, thoroughly, through and through, totally, utterly, well, wholly, wideWords Related to fast absolutely, categorically, cold, downright, hands down, plain, stone, stone-cold, unqualifiedly; basically, by and large, chiefly, generally, largely, mainly, more or less, mostly, overall, predominantly, predominately, primarily, principally, substantially; abundantly, copiously, generously, greatlyNear Antonyms of fast barely, hardly, just, kind of, marginally, minimally, scarcely, slightly, superficially; approximately, roughly, somewhatAntonyms of fast half, halfway, incompletely, part, partially, partly



Seen and Heard

What made you want to look up fast? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!