| flapping | |
| flat(adjective, physical inertness) | |
| foul | |
| give(noun, excess, looseness) | |
| goof off(verb, expression, phrasal verb, work) | |
| impotent(adjective, still, lifeless, inactive, passive) | |
| inadvertent(adjective, careless, indifferent, coarse, unconcerned) | |
| lagging(dull, slow, careless, sluggish, dubious) | |
| languorous(adjective, dull, slow, careless, indifferent) | |
| leaden(adjective, dull, quiet, moderate, easy) | |
| leisurely(adjective, easy, slow, relaxed, loose) | |
| lenient(adjective, soft, tolerant, remiss) | |
| lessening | |
| light(adjective, open, evil, loose, degenerate) | |
| loaf(verb, stop, delay, rest, relax) | |
| looseness | |
| lull(noun, verb, calm, quiet, subdue) | |
| phlegmatic(adjective, dull, quiet, moderate, easy) | |
| promiscuous | |
| quag |
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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> |