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Adjective fast has 10 senses
  1. fast - acting or moving or capable of acting or moving quickly; "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car"
    slow, bumper-to-bumper, dilatory, laggard, poky, pokey, dragging, drawn-out, lazy, long-play, long-playing, slow-moving, sluggish
  2. fast - (used of timepieces) indicating a time ahead of or later than the correct time; "my watch is fast"
  3. fast - at a rapid tempo; "the band played a fast fox trot"
    slow, adagio, andante, lento, lentissimo, largo, larghetto, larghissimo, moderato
  4. fast - (of surfaces) conducive to rapid speeds; "a fast road"; "grass courts are faster than clay"
    rough, unsmooth (indirect, via smooth)
  5. barred, bolted, fast, latched, locked, secured - firmly fastened or secured against opening; "windows and doors were all fast"; "a locked closet"; "left the house properly secured"
    Antonym: unfastened (indirect, via fastened)
  6. fast - resistant to destruction or fading; "fast colors"
    pervious (indirect, via impervious)
  7. debauched, degenerate, degraded, dissipated, dissolute, libertine, profligate, riotous, fast - unrestrained by convention or morality; "Congreve draws a debauched aristocratic society"; "deplorably dissipated and degraded"; "riotous living"; "fast women"
    Antonym: moral (indirect, via immoral, amoral)
    Antonyms: amoral, unmoral (indirect, via moral, immoral)
  8. flying, quick, fast - hurried and brief; "paid a flying visit"; "took a flying glance at the book"; "a quick inspection"; "a fast visit"
    Antonym: unhurried (indirect, via hurried)
  9. fast, firm, immobile - securely fixed in place; "the post was still firm after being hit by the car"
    Antonym: unfixed (indirect, via fixed)
  10. firm, loyal, truehearted, fast - unwavering in devotion to friend or vow or cause; "a firm ally"; "loyal supporters"; "the true-hearted soldier...of Tippecanoe"- Campaign song for William Henry Harrison; "fast friends"
    Antonym: unfaithful (indirect, via faithful)
Adverbial fast has 2 senses
  1. fast - quickly or rapidly (often used as a combining form); "how fast can he get here?"; "ran as fast as he could"; "needs medical help fast"; "fast-running rivers"; "fast-breaking news"; "fast-opening (or fast-closing) shutters"
  2. fast, tight - firmly or tightly; "held fast to the rope"; "her foot was stuck fast"; "held tight"
Noun fast has 1 sense
  1. fast, fasting - abstaining from food
    --1 is a kind of abstinence
    --1 has particulars: diet, dieting; hunger strike; Ramadan
    Derived forms: verb fast2, verb fast1
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