fast

fast

adverb

Definition of FAST

1

with great speed <run as fast as you can to get help>

Synonyms 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

Related Words 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 laggardly, lingeringly, ploddingly, sluggishly; deliberately, leisurely; belatedly, delinquently, tardily

Antonyms slow, slowly

2

to a full extent or degree <everyone in camp was fast asleep within minutes of hitting the sack>

Synonyms all, all of, all over, altogether, clean, completely, dead, enough, entire, entirely, even, exactly, fast, flat, full, heartily, out, perfectly, plumb [chiefly dialect], quite, soundly, thoroughly, through and through, totally, utterly, well, wholly, wide

Related Words 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, greatly

Near Antonyms barely, hardly, just, kind of, marginally, minimally, scarcely, slightly, superficially; approximately, roughly, somewhat

Antonyms half, halfway, incompletely, part, partially, partly