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slack has 23 distinct synonyms spread across 11 of its 17 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve
a noticeable deterioration in performance or quality
“the team went into a slump”
1 of the 17 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for slack.
Synonyms, antonyms and the broader and narrower relations for slack come from Princeton University’s WordNet. Full sources and licences.
a stretch of water without current or movement
“suddenly they were in a slack and the water was motionless”
a cord or rope or cable that is hanging loosely
“he took up the slack”