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fast has 16 distinct synonyms spread across 6 of its 15 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is slow.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
acting or moving or capable of acting or moving quickly
“fast film”
(used of timepieces) indicating a time ahead of or later than the correct time
“my watch is fast”
at a rapid tempo
“the band played a fast fox trot”
unrestrained by convention or morality
“Congreve draws a debauched aristocratic society”
abstain from eating
“Before the medical exam, you must fast”
4 of the 15 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for fast.
Synonyms, antonyms and the broader and narrower relations for fast come from Princeton University’s WordNet. Full sources and licences.