180 entries under reasonable topic. ×

11
equable(adjective, calm, quiet, sound, soft)
11
rational(adjective, calm, good, sound)
10
deliberate(adjective, calm, sound, soft)
10
together(adjective, calm, good, sound)
10
untroubled(adjective, feature, state, calm, quiet)
9
even(adjective, calm, quiet, soft)
9
good(adjective, kind, great, pleasant)
9
neutral(adjective, calm, quiet, sensible)
9
pacific(adjective, calm, quiet, weak, smooth)
8
coolheaded(adjective, calm, sound, sensible)
8
peachy(adjective, good, great, pleasant)
8
restrained(adjective, calm, close, quiet)
8
reticent(adjective, calm, quiet, attitude)
8
sane(adjective, calm, sound, sensible)
8
sensible(adjective, calm, good, sound, smooth)
8
undemonstrative(adjective, calm, dull, quiet)
7
objective(adjective, calm, sound, sensible)
7
practical(adjective, calm, sound, smart)
7
soft(adjective, calm, quiet, weak, smooth)
7
unimpassioned(adjective, calm, moderate, restrained)
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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>