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Definition of fast :
1. A time of fasting, whether a day, week, or longer time; a period of abstinence from food or certain kinds of food; as, an annual fast.
2. Abstinence from food; omission to take nourishment.
3. Firm against attack; fortified by nature or art; impregnable; strong.
4. Firm in adherence; steadfast; not easily separated or alienated; faithful; as, a fast friend.
5. Firmly fixed; closely adhering; made firm; not loose, unstable, or easily moved; immovable; as, to make fast the door.
6. Given to pleasure seeking; disregardful of restraint; reckless; wild; dissipated; dissolute; as, a fast man; a fast liver.
7. In a fast or rapid manner; quickly; swiftly; extravagantly; wildly; as, to run fast; to live fast.
8. In a fast, fixed, or firmly established manner; fixedly; firmly; immovably.
9. In such a condition, as to resilience, etc., as to make possible unusual rapidity of play or action; as, a fast racket, or tennis court; a fast track; a fast billiard table, etc.
10. Moving rapidly; quick in mition; rapid; swift; as, a fast horse.
11. Not easily disturbed or broken; deep; sound.
12. Permanent; not liable to fade by exposure to air or by washing; durable; lasting; as, fast colors.
13. Tenacious; retentive.
14. That which fastens or holds; especially, ( Naut.) a mooring rope, hawser, or chain; - called, according to its position, a bow, head, quarter, breast, or stern fast; also, a post on a pier around which hawsers are passed in mooring.
15. The shaft of a column, or trunk of pilaster.
16. To abstain from food; to omit to take nourishment in whole or in part; to go hungry.
17. To practice abstinence as a religious exercise or duty; to abstain from food voluntarily for a time, for the mortification of the body or appetites, or as a token of grief, or humiliation and penitence.
18. Voluntary abstinence from food, for a space of time, as a spiritual discipline, or as a token of religious humiliation.
Synonyms:
high-speed, slow, full tilt, tinted, lewd, free, indelible, devalued, luxuriant, vivace, instant, debased, betting, unfaltering, profuse, like a flash, uncontrolled, degraded, go hungry, like a bat out of hell, ready, mercurial, in a flash, sex, accelerating, unshakable, loyal, debauched, washable, liege, fastened, troubled, not eat, high-velocity, immobile, straightaway, sure, like a house on fire, rakish, like a streak, closely, accelerated, instantaneous, fixed, lickety-split, forbear eating, red hot, dissolute, starve, lush, spry, immoral, double-quick, steady, riotous, in nothing flat, prestissimo, posthaste, winged, loose, warm, speeding, misbehave, sluggish, hastening, solid, colorfast, flirtatious, wild, apace, fleeting, bolted, sporting, like a shot, extravagant, andantino, express, tumultuous, active, lasting, durable, like wildfire, clinging, alacritous, diet, true, swift-footed, deceive, racing, strong, locked, turbulent, short, run wild, stable, flat out, immediate, dissipated, pronto, tighten, degenerate, quickly, allegretto, restraint, uninhibited, unbridled, licentious, unconstrained, observe a fast, unrestrained, prompt, firm, hot, brief, unwavering, whorish, card-playing, exuberant, profligate, secured, fast-flying, spendthrift, close, tenacious, unbendable, prodigal, blistering, easy, secure, faithful, unfluctuating, constant, libertine, electric, headlong, like a blue streak, incontinent, steadfast, latched, disruptive, be careless, truehearted, abandoned, staunch, light, scurrying, agile, immovable, meteoric, ungoverned, wanton, stiff, precipitate, Allegiant, hell-for-leather, like the wind, barred, fasting, waterproof, like greased lightning, trust, gay, tight, dyed, continue, smooth
fast (part of speech: adjective)
hurrying, light-footed, expeditious, allegro, nimble, snappy, presto
hasty (part of speech: adjective)
feverish, abrupt, flying, rapid, quick, pelting, brisk, impatient, running, breathless, breakneck, fleet, speedy, dashing, swift, hasty, rushing, urgent, bustling, darting, galloping, hurried
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