| slack | (adjective) not tense or taut | Synonyms: loose |
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| (adjective) lacking in rigor or strictness | Synonyms: lax |
| (adjective) flowing with little speed as e.g. at the turning of the tide | - |
| (noun) a cord or rope or cable that is hanging loosely | - |
| (noun) the quality of being loose (not taut) | Synonyms: slackness |
| (noun) a stretch of water without current or movement | Synonyms: slack water |
| (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quag, quagmire |
| (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slump |
| (noun) dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve | - |
| (verb) release tension on | - |
| (verb) make less active or fast | Synonyms: relax, slack up, slacken |
| (verb) make less active or intense | Synonyms: abate, slake |
| (verb) become slow or slower | Synonyms: slacken, slow, slow down, slow up |
| (verb) cause to heat and crumble by treatment with water | Synonyms: slake |
| (verb) become less in amount or intensity | Synonyms: abate, die away, let up, slack off |
| (verb) be inattentive to, or neglect | - |
| (verb) avoid responsibilities and work, be idle | - |
| slacken | (verb) become looser or slack | - |
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| (verb) make slack as by lessening tension or firmness | Synonyms: remit |
| (verb) become slow or slower | Synonyms: slack, slow, slow down, slow up |
| (verb) make less active or fast | Synonyms: relax, slack, slack up |
| slackening | (noun) an occurrence of control or strength weakening | Synonyms: loosening, relaxation |
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| slacker | (noun) a person who shirks his work or duty (especially one who tries to evade military service in wartime) | Synonyms: shirker |
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| slacking | (noun) the evasion of work or duty | Synonyms: goldbricking, goofing off, shirking, soldiering |
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| slackline | (noun) a partially tensioned line for balance or walking | - |
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| slackly | (adverb) in a relaxed manner; not rigid | Synonyms: loosely |
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| slackness | (noun) the quality of being loose (not taut) | Synonyms: slack |
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| (noun) the quality of being lax and neglectful | Synonyms: laxity, laxness, remissness |
| (noun) weakness characterized by a lack of vitality or energy | Synonyms: inanition, lassitude, lethargy |
| slacks | (noun) (used in the plural) pants for casual wear | - |
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