6
unwind(verb, stop, calm, delay, rest)
5
backward(adjective, dull, low, slow, late)
5
damp(insulation, refrigeration, fire extinction)
5
dead(dull, quiet, flat, still, lifeless)
5
dissolute(adjective, restraint, indulgent)
5
drop-off
5
effete(adjective, weakness)
5
faint(weakness, lethargic, languid, indolent)
5
flexible(adjective, loose, lifeless, inactive, baggy)
5
gradual(dull, late, slowness, behind)
5
hanging(adjective, clear, separate, weak, free)
5
heedless(noun, adjective, careless, indifferent, loose)
5
incoherent(adjective, loose, coherence)
5
infirm(adjective, weak, weakness, loose, lifeless)
5
let go(verb, expression, idiom, calm, rest)
5
neglect(verb, do, avoid)
5
otiose(adjective, inactivity)
5
permissive(adjective, soft, tolerant, lazy, lenient)
5
quench(insulation, fire extinction)
5
reduce(verb, calm, release, moderate, decrease)
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APASmart Define. (2016). slack thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/slack/thesaurus/synonyms
ChicagoSmart Define. 2016. "slack thesaurus" https://smartdefine.org/slack/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, slack thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/slack/thesaurus/synonyms>.
MLASmart Define. "slack thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/slack/thesaurus/synonyms>