| regardless(adjective, soft, careless, indifferent, unconcerned) | |
| relaxation(noun, loosening) | |
| room(noun, excess, looseness) | |
| slack up | |
| slow-up(noun, excess, looseness) | |
| slowdown(noun, decrease, excess, off, looseness) | |
| spiritless(adjective, dull, quiet, flat, heavy) | |
| weaken(verb, calm, reduce, release, moderate) | |
| broad(adjective, soft, tolerant, lenient, remiss) | |
| creeping | |
| decompress | |
| delay(stop, drop, decline, decrease, strike) | |
| die away(verb, expression, phrasal verb) | |
| diminish(verb, calm, reduce, release, moderate) | |
| disinclined(adjective, quiet, easy, heavy, deliberate) | |
| douse(insulation, fire extinction) | |
| dronish | |
| easy-going(adjective, lazy, negligent, torpid) | |
| faintish | |
| falling off(noun, verb, expression, phrasal verb) |
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| APA | Smart Define. (2016). slack thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/slack/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "slack thesaurus" https://smartdefine.org/slack/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, slack thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/slack/thesaurus/synonyms>. |
| MLA | Smart Define. "slack thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/slack/thesaurus/synonyms> |