192 entries under sober topic. ×

20
unexcited(adjective, characteristic, calm, quiet, easy)
20
unmoved(adjective, calm, quiet, mean, hard)
19
cold-blooded(adjective, calm, person, mean, hard)
18
sedate(verb, adjective, calm, quiet, settle)
18
unfeeling(adjective, calm, dull, mean, hard)
17
unflappable(adjective, calm, quiet, reasonable, sensible)
16
glacial(adjective, person, severe, keen, sharp)
16
remote(adjective, attitude, informal, relaxed, cold)
16
steady(verb, adjective, calm, quiet, settle)
15
temperate(adjective, calm, dull, quiet, weak)
13
stolid(adjective, calm, quiet, indifferent, casual)
11
rational(adjective, calm, good, sound, reasonable)
11
unexcitable(adjective, calm, dull, quiet, easy)
10
deliberate(adjective, calm, sound, soft, reasonable)
10
staid(adjective, calm, set, firm, sensible)
10
together(adjective, calm, good, sound, reasonable)
9
neutral(adjective, calm, quiet, reasonable, sensible)
9
reasonable(adjective, calm, good, quiet, sound)
9
tough(adjective, calm, mean, bad, strong)
8
heartless(adjective, mean, hard, unpleasant, cold)
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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>