28
slow(verb, adjective, calm, dull, quiet)
26
lax(adjective, calm, dull, clear, separate)
26
loose(verb, adjective, calm, quiet, clear)
24
sluggish(adjective, dull, quiet, increase, flat)
19
dull(adjective, quiet, increase, weakness, low)
19
indolent(adjective, dull, quiet, easy, slow)
18
limp(adjective, dull, clear, separate, weak)
18
inactive(adjective, action, dull, quiet, flat)
18
remiss(noun, adjective, dull, soft, slow)
18
soft(adjective, increase, weak, careless, loose)
16
negligent(noun, adjective, quiet, soft, slow)
15
flaccid(adjective, clear, separate, weak, free)
15
idle(verb, adjective, stop, dull, quiet)
14
weak(adjective, soft, loose, feeble, unhealthy)
13
careless(noun, adjective, dull, soft, indifferent)
13
inert(adjective, dull, quiet, moving, flat)
13
lazy(verb, adjective, dull, easy, slow)
12
listless(adjective, dull, quiet, energy, easy)
12
neglectful(noun, adjective, dull, soft, slow)
12
relax(verb, stop, calm, quiet, reduce)
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APASmart Define. (2016). slack thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/slack/thesaurus/synonyms
ChicagoSmart Define. 2016. "slack thesaurus" https://smartdefine.org/slack/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, slack thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/slack/thesaurus/synonyms>.
MLASmart Define. "slack thesaurus" 26 February 2016. Web. 20 September 2026. <https://smartdefine.org/slack/thesaurus/synonyms>