1. (noun) slack
dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve
Synonyms: quag, slackness, falloff, falling off, slack water, morass, slump, drop-off, quagmire, mire
Antonyms: tense, diligent, running(a)
2. (noun) slump, slack, drop-off, falloff, falling off
a noticeable deterioration in performance or quality
Synonyms: slackness, economic crisis, falloff, slack water, cliff, morass, drop, depression, falling off, quag, lessening, mire, decrease, quagmire, slack, drop-off, slump
Antonyms: tense, running(a), diligent
3. (noun) slack, slack water
a stretch of water without current or movement
Synonyms: quag, slackness, falloff, slack, slack tide, falling off, slack water, morass, slump, drop-off, quagmire, mire
Antonyms: diligent, tense, running(a)
4. (noun) mire, quagmire, quag, morass, slack
a soft wet area of low-lying land that sinks underfoot
Synonyms: quag, slackness, falloff, slop, slack, falling off, slack water, morass, slump, drop-off, quagmire, mire
Antonyms: running(a), diligent, tense
5. (noun) slack, slackness
the quality of being loose (not taut)
Synonyms: slackness, falloff, remissness, inanition, slack water, laxity, lethargy, morass, falling off, laxness, lassitude, quag, mire, quagmire, slack, drop-off, slump
Antonyms: running(a), diligent, tense
6. (adj) slack
a cord or rope or cable that is hanging loosely
Synonyms: quag, slackness, falloff, falling off, slack water, morass, slump, drop-off, quagmire, mire
Antonyms: tense, running(a), diligent
7. (adj) loose, slack
not tense or taut
Synonyms: idle, promiscuous, informal, easy, wanton, sluttish, escaped, liberal, free, open, lax, loose, unaffixed, on the loose(p), light, slack, at large(p)
Antonyms: diligent, tense, running(a)
8. (adj) slack
flowing with little speed as e.g. at the turning of the tide
Synonyms: loose, lax
Antonyms: running(a), tense, diligent
9. (verb) lax, slack
lacking in rigor or strictness
Synonyms: loose, slack, lax
Antonyms: running(a), tense, diligent
10. (verb) slack
avoid responsibilities and work, be idle
Synonyms: slack off, abate, die away, slake, relax, slow up, slow, slacken, slow down, let up, slack up
Antonyms: diligent, tense, running(a)
11. (verb) slack
be inattentive to, or neglect
Synonyms: slack off, abate, die away, slake, relax, slow up, slow, slacken, slow down, let up, slack up
Antonyms: running(a), tense, diligent
12. (verb) slack
release tension on
Synonyms: slack off, abate, die away, slake, relax, slow up, slow, slacken, slow down, let up, slack up
Antonyms: running(a), tense, diligent
13. (verb) slack, slacken, slack up, relax
make less active or fast
Synonyms: unstrain, decompress, slow down, unbend, slacken, loosen, remit, let up, unlax, slack off, abate, loosen up, slow, loose, slack up, slake, relax, slack, die away, unwind, make relaxed, slow up
Antonyms: diligent, tense, running(a)
14. (verb) slow, slow down, slow up, slack, slacken
become slow or slower
Synonyms: decompress, slow down, unbend, slacken, remit, let up, slack off, abate, loosen up, slow, decelerate, slack up, retard, slake, relax, slack, die away, unwind, slow up
Antonyms: running(a), tense, diligent
15. (verb) slake, abate, slack
make less active or intense
Synonyms: slack off, slack, allay, abate, slow down, slake, slow up, slow, quench, slacken, assuage, relax, die away, let up, slack up
Antonyms: tense, running(a), diligent
16. (verb) abate, let up, slack off, slack, die away
become less in amount or intensity
Synonyms: slack off, slack, ease off, abate, die away, slow up, relax, slacken, slake, slow, slack up, slow down, let up, ease up
Antonyms: diligent, tense, running(a)
17. (verb) slack, slake
cause to heat and crumble by treatment with water
Synonyms: slack off, allay, abate, die away, slake, slack, relax, slow up, assuage, slow, slacken, quench, slow down, let up, slack up
Antonyms: tense, running(a), diligent
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Synonyms and Antonyms of slack 
