fast

Definitions

1. adjective

   Moving at high speed.

   Examples

   • I am going to buy a fast car.
   • The cheetah is the fastest land animal.
   ≈quick≈speedy≈light
2. adverb

   Quickly.

   Examples

   • He ran fast.
   • Don't drive so fast.
3. adjective

   Held firmly in place.

   Examples

   • Make that rope fast.
   • He tied the boat fast to the dock.
   ≈firm≈immobile≈secure≈stable≈stuck +2 more
4. adjective

   Strong and safe from attack, in old-fashioned use.

   Examples

   • The fortress was fast against any siege.
   • Outlaws hid in fast places in the woods.
   ≈fortified≈impenetrable≠penetrable≠weak
5. adjective

   Loyal and faithful, as in fast friends.

   Examples

   • They remained fast friends for over forty years.
   • She held him fast.
6. adjective

   Not losing color in water or light.

   Examples

   • All the washing came out pink, because the red shirt was not fast.
   • This dye is fast and will not run.
   ≈colour-fast
7. adjective

   Busy and full of action, as a place.

   Examples

   • Sydney is a fast city.
   • New York is famous for being a fast city.
8. adjective

   Making play quicker, as a court or track.

   Examples

   • The bowlers liked the fast track.
   • It is a fast tennis court.
9. adjective

   Able to send data quickly.

   Examples

   • We upgraded to a fast internet connection.
   • The new chip handles fast data transfers easily.
   ≈quick≈rapid≈speedy≈swift≈easy
10. adjective

    Deep, as sleep.

    Examples

    • The baby was fast asleep within minutes.
    • He fell into a fast sleep after the long trip.
    ≈deep≈sound≠light
11. adjective

    In physics, moving with high energy, as some particles.

    Examples

    • Fast neutrons must be slowed before they help a chain reaction.
    • The scientist studied fast neutrons.
    ≈quick≈speedy≈light
12. verb

    To not eat for a time, often for religious or health reasons.

    Examples

    • Muslims fast during Ramadan.
    • She fasts once a week.