Synonyms for "fast"
Looking for another word for "fast"? Common synonyms include quick, swift, rapid, speedy, fleet.
Quick answer
The best synonym for "fast" depends on what you mean. For people: nimble, agile, quick-thinking. For processes: expedited, immediate, prompt.
Synonym groups by meaning
"fast" meaning: quick in motion
quickswiftrapidspeedyfleet
"fast" meaning: happening quickly
rapidspeedyexpeditedpromptimmediate
Choose by tone or context
A thesaurus gives you a list; choosing is the next step. Match the synonym to the dimension of meaning you want — formal vs. casual, intense vs. softened, professional vs. conversational.