20
unmoved(adjective, calm, quiet, mean, hard)
20
great(adjective, good, pleasant, excellent, fine)
20
keen(adjective, good, great, pleasant, severe)
19
cold-blooded(adjective, calm, person, mean, hard)
19
confident(adjective, calm, quiet, solid, relaxed)
18
self-possessed(adjective, calm, quiet, reasonable, firm)
18
controlled(adjective, calm, close, quiet, reasonable)
18
relaxed(verb, adjective, feature, state, calm)
18
sedate(verb, adjective, calm, quiet, settle)
18
unfeeling(adjective, calm, dull, mean, hard)
18
mean(adjective, person, hard, great, pleasant)
18
neat(adjective, good, great, pleasant, excellent)
18
stoic(adjective, calm, cold, indifferent, blank)
17
bold(adjective, person, mean, strong, tough)
17
unflappable(adjective, calm, quiet, reasonable, sensible)
17
insouciant(adjective, feature, state, calm, happy)
17
undisturbed(adjective, feature, state, calm, quiet)
17
wonderful(adjective, great, job, amazing, very best kind)
16
refrigerate(verb, adjective, activity, chill, refrigerate)
16
even-tempered(adjective, calm, sound, easy, sensible)
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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>