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  1. fast
  2. adjective


    • 1. at high speed:

      he was driving too fast
      Synonym : quickly, rapidly, swiftly, speedily, briskly, at speed, at full speed, at full tilt, energetically, hastily, with all haste, in haste, hurriedly, in a hurry, post-haste, pell-mell, without delay, expeditiously, with dispatch, like a shot, like a flash, in a flash, in the blink of an eye, in a wink, in a trice, in no time (at all), on the double, at the speed of light, like an arrow from a bow, double quick, in double quick time, p.d.q. (pretty damn quick), nippily, like (greased) lightning, at warp speed, hell for leather, like mad, like crazy, like the wind, like a bomb, like nobody's business, like a scalded cat, like the deuce, a mile a minute, like a bat out of hell, at warp speed, like the clappers, at a rate of knots, like billy-o, lickety-split, apace
    • 2. within a short time:

      we're going to have to get to the bottom of this fast
    • 3. so as to be hard to move; securely:

      the ship was held fast by the anchor chain
      Synonym : securely, tightly, immovably, fixedly, firmly
    • 4. so as to be hard to wake:

      they were too fast asleep to reply
      Synonym : deeply, sound, completely