fast
adjective
/fæst/
Moving or operating at high speed.
Quick answer
Common synonyms for "fast" include quick, swift, rapid, speedy, fleet. Choose by context — see groups below.
Synonyms for "fast"
fast — quick in motion
quickswiftrapidspeedyfleet
fast — happening quickly
rapidspeedyexpeditedpromptimmediate
Antonyms for "fast"
Examples in context
- She's a fast reader — knocks out a novel a week.
- We need a fast turnaround on this.
- Markets move fast right now.
Usage note
For people: nimble, agile, quick-thinking. For processes: expedited, immediate, prompt.