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fast

/fɑːst/
noun
  1. A train that calls at only some stations it passes between its origin and destination, typically just the principal stations

    Similar: express, express train

Synonymsexpress, express train
Antonymslocal, slow train, stopper
adjective
  1. Firmly or securely fixed in place; stable.

    "That rope is dangerously loose. Make it fast!"

    Similar: firm, immobile, secure, stable, stuck

  2. Firm against attack; fortified by nature or art; impregnable; strong.

    Similar: fortified, impenetrable

  3. (of people) Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).)

Synonymsquick, rapid, speedy, swift, easy, slutty
Antonymsslow, behind, slow, light, loose, penetrable
adverb
  1. In a firm or secure manner, securely; in such a way as not to be moved; safe, sound .

    "Hold this rope as fast as you can."

    Similar: firmly, securely, tightly

  2. (of sleeping) Deeply or soundly .

    "He is fast asleep."

    Similar: deeply

  3. Immediately following in place or time; close, very near .

    "Fast by the sturdy batsman the ball unheeded sped. / That ain't my style, said Casey. Strike one, the umpire said."

Synonymsahead, deeply, firmly, securely, tightly, quickly
Antonymsbehind, lightly, loosely, slowly
interjection
  1. Short for "stand fast", a warning not to pass between the arrow and the target

Antonymsloose

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