Word.ws English Dictionary

Synonyms of fast

32 similar words · 12 opposite words

Another word for fast is quick. Other synonyms of fast are speedy. The opposite of fast is behind.

Synonyms and similar words for fast

adjectiveFirmly or securely fixed in place; stable.

adjectiveFirm against attack; fortified by nature or art; impregnable; strong.

adjectiveMoving with great speed, or capable of doing so; swift, rapid; light.

  • quickMoving with speed, rapidity or swiftness, or capable of doing so; rapid; fast.
  • speedyProceeding with or characterized by high speed; rapid.
  • lightFast; nimble.

adjectiveAble to transfer data in a short period of time.

adjectiveDeep or sound (of sleep); fast asleep (of people).

  • deepSound, heavy (describing a state of sleep from which one is not easily awoken).
  • sound

adjectiveNot running or fading when subjected to detrimental conditions such as wetness or intense light...

adjectiveAhead of the correct time or schedule.

nounA train that calls at only some stations it passes between its origin and destination, typically...

  • express
  • express trainA train (either the service or the train itself) making limited stops.
  • fast train

adverbIn a firm or secure manner, securely; in such a way as not to be moved; safe, sound .

adverbDeeply or soundly .

adverbQuickly, with great speed; within a short time .

  • quicklyRapidly; with speed; fast; with expedition.
  • rapidlyWith speed; in a rapid manner.
  • speedilyIn a speedy or fast manner.
  • swiftlyIn a swift manner; quickly; with quick motion or velocity; fleetly.

adjectiveMore synonyms

  • sluttyOf, resembling, or suitable for, a slut.

Opposite of fast

adjectiveFirmly or securely fixed in place; stable.

adjectiveFirm against attack; fortified by nature or art; impregnable; strong.

adjectiveDeep or sound (of sleep); fast asleep (of people).

adjectiveAhead of the correct time or schedule.

nounA train that calls at only some stations it passes between its origin and destination, typically...

adverbIn a firm or secure manner, securely; in such a way as not to be moved; safe, sound .

adverbDeeply or soundly .

adverbQuickly, with great speed; within a short time .

Meaning of fast

  1. adjective Firmly or securely fixed in place; stable.
  2. adjective Firm against attack; fortified by nature or art; impregnable; strong.
  3. adjective Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).).

Full definition of fast

fast in other languages

Questions about synonyms of fast

What is another word for fast?
Fast has 32 synonyms on Word.ws, such as quick and speedy.
What is the opposite of fast?
The opposite of fast is behind.
What does fast mean?
Fast means firmly or securely fixed in place; stable.

Source and license

Adapted from Wiktionary: fast (page history and authors) and the entries of the words listed. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws grouped the synonyms and antonyms by meaning and added links. Wiktionary data of 2026-09-02.

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Cite this page: “Synonyms of fast.” Word.ws, https://word.ws/synonyms/fast. Based on Wiktionary, CC BY-SA 4.0.