180 entries under reasonable topic. ×

83
calm(verb, adjective, feature, state, action)
48
composed(adjective, calm, person, quiet)
46
indifferent(adjective, feature, state, characteristic, calm)
46
dispassionate(adjective, calm, dull, quiet)
41
tranquil(adjective, feature, state, calm, quiet)
25
moderate(verb, adjective, activity, stop, action)
24
collected(adjective, calm, quiet, sound)
21
reserved(adjective, calm, moderate, firm)
20
sober(adjective, calm, good, dull, quiet)
18
self-possessed(adjective, calm, quiet, firm)
18
controlled(adjective, calm, close, quiet)
18
mean(adjective, person, hard, great, pleasant)
17
unflappable(adjective, calm, quiet, sensible)
16
steady(verb, adjective, calm, quiet, settle)
15
temperate(adjective, calm, dull, quiet, weak)
14
self-controlled(adjective, calm, quiet, moderate)
13
groovy(adjective, good, great, excellent)
12
gentle(adjective, calm, quiet, weak, kind)
12
level-headed(adjective, calm, sound, tough)
12
mild(adjective, feature, state, calm, dull)
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APASmart Define. (2016). cool thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/cool/thesaurus/synonyms
ChicagoSmart Define. 2016. "cool thesaurus" https://smartdefine.org/cool/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, cool thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/cool/thesaurus/synonyms>.
MLASmart Define. "cool thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/cool/thesaurus/synonyms>