fast

noun

(British, rail transport) A train that calls at only some stations it passes between its origin and destination, typically just the principal stations.

The act or practice of fasting, religious abstinence from food.

Any of the fasting periods in the liturgical year.

A surname.

Acronym of focused assessment with sonography for trauma.

Acronym of firefighter assist and search team.

Acronym of free advertising-supported streaming television

Initialism of Five-hundred-meter Aperture Spherical Telescope.

verb

(intransitive) To practice religious abstinence, especially from food.

(intransitive) To reduce or limit one's nutrition intake for medical or health reasons, to diet.

(transitive, sciences) To cause (a person or animal) to abstain, especially from eating.

adjective

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

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

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

(nuclear physics, of a neutron) Having a kinetic energy between 1 million and 20 million electron volts; often used to describe the energy state of free neutrons at the moment of their release by a nuclear fission or nuclear fusion reaction (i.e., before the neutrons have been slowed down by anything).

Of a place, characterised by business, hustle and bustle, etc.

Causing unusual rapidity of play or action.

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

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

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

Ahead of the correct time or schedule.

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

(mnemonic, acronym) An acronym for remembering desirable characteristics for goal-setting: frequently discussed, ambitious, specific, transparent.

(dated) Firmly or securely fixed in place; stable.

(dated) Having an extravagant lifestyle or immoral habits.

(offensive, vernacular, dated, of a girl or young woman) Uncharacteristically mature or promiscuous for one's age.

(obsolete) Tenacious; retentive.

adverb

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

(of sleeping) Deeply or soundly .

Immediately following in place or time; close, very near .

Quickly, with great speed; within a short time .

Ahead of the correct time or schedule.

Synonyms for fast

quickadj speedyadj rapidadj quicklyadv expeditiousadj rapidlyadv swiftlyadv apaceadv acceleratedadj expeditiouslyadv breakneckadj nimbleadj

Synonyms & related words for fast

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Words related to fast

Explore words related to fast — words associated with it, words that go with it, and its nearest matches in meaning. Related words include alacritous, prestissimo, vivace, speediness, rapidness, pacey, fleetly, swiftest. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for fast

Common synonyms for fast include quick, speedy, rapid, quickly, expeditious, rapidly, swiftly, apace — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.