168 entries under cool topic. ×

14
unperturbed(adjective, calm, quiet, easy)
13
quiescent(adjective, calm, quiet, smooth)
13
self-possessed(adjective, calm, quiet, moderate)
11
detached(adjective, calm, quiet, moderate)
11
dispassionate(adjective, calm, quiet, moderate)
11
halcyon(adjective, calm, quiet, smooth)
11
impassive(adjective, calm, quiet, moderate)
11
moderate(adjective, calm, quiet, weak)
11
unflappable(adjective, calm, quiet, smooth)
10
reposeful(adjective, quiet, smooth, mild)
10
temperate(adjective, calm, quiet, weak)
9
easy(adjective, calm, quiet, weak)
9
hushed(adjective, calm, quiet, smooth)
9
inactive(adjective, dull, quiet, smooth)
8
sober(adjective, calm, easy, relaxed)
7
mellow(adjective, calm, quiet, weak)
7
relaxed(adjective, calm, quiet, moderate)
6
demure(adjective, calm, quiet, gentle)
6
motionless(adjective, calm, quiet, smooth)
6
nonchalant(adjective, calm, quiet, mild)
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APASmart Define. (2016). placid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/placid/thesaurus/synonyms
ChicagoSmart Define. 2016. "placid thesaurus" https://smartdefine.org/placid/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, placid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/placid/thesaurus/synonyms>.
MLASmart Define. "placid thesaurus" 29 February 2016. Web. 25 September 2026. <https://smartdefine.org/placid/thesaurus/synonyms>