i.e. pink, cat, sing, well

fast

/fɑːst/
/fɑːst/
/fæst/
/fæst/

noun

• A train that calls at only some stations it passes between its origin and destination, typically just the principal stations

Synonyms:
  • express
  • express train
Antonyms:
  • local
  • slow train
  • stopper

adjective

• Firmly or securely fixed in place; stable.

That rope is dangerously loose. Make it fast!
Synonyms:
  • firm
  • immobile
  • secure
  • stable
  • stuck
  • tight
Antonyms:
  • loose

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

Synonyms:
  • fortified
  • impenetrable
Antonyms:
  • penetrable
  • weak

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

Synonyms:
    Antonyms:

      • Moving with great speed, or capable of doing so; swift, rapid.

      I am going to buy a fast car.
      Synonyms:
      • quick
      • rapid
      • speedy
      Antonyms:

        • Causing unusual rapidity of play or action.

        a fast billiard table
        Synonyms:
          Antonyms:

            • (of a piece of hardware) Able to transfer data in a short period of time.

            Synonyms:
              Antonyms:

                • Deep or sound (of sleep); fast asleep (of people).

                Synonyms:
                • deep
                • sound
                Antonyms:
                • light

                • (of dyes or colours) Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.

                All the washing has come out pink. That red tee-shirt was not fast.
                Synonyms:
                • colour-fast
                Antonyms:

                  • Tenacious; retentive.

                  Synonyms:
                    Antonyms:

                      • Having an extravagant lifestyle or immoral habits.

                      a fast woman
                      Synonyms:
                        Antonyms:

                          • Ahead of the correct time or schedule.

                          There must be something wrong with the hall clock. It is always fast.
                          Synonyms:
                          • ahead
                          Antonyms:
                          • behind
                          • slow

                          • (of photographic film) More sensitive to light than average.

                          Synonyms:
                            Antonyms:

                              adverb

                              • 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.
                              Synonyms:
                              • firmly
                              • securely
                              • tightly
                              Antonyms:
                              • loosely

                              • (of sleeping) Deeply or soundly .

                              He is fast asleep.
                              Synonyms:
                              • deeply
                              Antonyms:
                              • lightly

                              • 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.
                              Synonyms:
                                Antonyms:

                                  • Quickly, with great speed; within a short time .

                                  Do it as fast as you can.
                                  Synonyms:
                                  • quickly
                                  • rapidly
                                  • speedily
                                  • swiftly
                                  Antonyms:
                                  • slowly

                                  • Ahead of the correct time or schedule.

                                  I think my watch is running fast.
                                  Synonyms:
                                  • ahead
                                  Antonyms:
                                  • behind

                                  interjection

                                  • Short for "stand fast", a warning not to pass between the arrow and the target

                                  Synonyms:
                                    Antonyms:
                                    • loose