(noun, adjective, verb, adverb, interjection)


1. acting or moving or capable of acting or moving quickly

- fast car

- on the fast track in school

- set a fast pace

Similar word(s): accelerated, alacritous, blistering, hot, express, fleet, swift, hurrying, scurrying, immediate, prompt, quick, straightaway, instant, instantaneous, meteoric, speedy, rapid, smart, winged, windy, sudden, hurried

2. (used of timepieces) indicating a time ahead of or later than the correct time

- my watch is fast

3. at a rapid tempo

- the band played a fast fox trot

Similar word(s): allegro, allegretto, andantino, presto, prestissimo, vivace

4. (of surfaces) conducive to rapid speeds

- a fast road

- grass courts are faster than clay

Similar word(s): smooth

5. resistant to destruction or fading

- fast colors

Similar word(s): imperviable, impervious

6. unrestrained by convention or morality

- fast women

Similar word(s): immoral, debauched, degenerate, degraded, dissipated, dissolute, libertine, profligate, riotous

7. hurried and brief

- a fast visit

Similar word(s): hurried, flying, quick

8. securely fixed in place

Similar word(s): fixed, firm, immobile

9. unwavering in devotion to friend or vow or cause

- fast friends

Similar word(s): faithful, firm, loyal, truehearted

10. (of a photographic lens or emulsion) causing a shortening of exposure time

- a fast lens

Similar word(s): causative

Sentences with fast as an adjective:

- That rope is dangerously loose. Make it fast!

- I am going to buy a fast car.

- a fast racket, or tennis court; a fast track; a fast billiard table

- All the washing has come out pink. That red tee-shirt was not fast.

- She's fast – she slept with him on their first date..

- There must be something wrong with the hall clock. It is always fast.


1. 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

2. firmly or closely

- held fast to the rope

- her foot was stuck fast

Similar word(s): tight

Sentences with fast as an adverb:

- Hold this rope as fast as you can.

- He is fast asleep.

- The horsemen came fast on our heels.

- Do it as fast as you can.

- I think my watch is running fast.


1. (archery) Short for "stand fast", a warning not to pass between the arrow and the target


1. abstaining from food

Similar word(s): fasting

Definition categories: act, abstinence


1. abstain from certain foods, as for religious or medical reasons

- Catholics sometimes fast during Lent

Definition categories: consumption, abstain, desist, refrain

2. abstain from eating

- Before the medical exam, you must fast

Definition categories: consumption, abstain, desist, refrain

Sentences with fast as a verb:

- Muslims fast during Ramadan.