159 entries under cool topic. ×

3
lackadaisical(adjective, calm, relaxed, indifferent)
3
levelheaded(adjective, calm, quiet, reasonable)
3
mellow(adjective, calm, quiet, kind)
3
negligent(adjective, feature, state, calm)
3
passionless(adjective, blank, aloof, unemotional)
3
possessed(adjective, calm, quiet, easy)
3
stoic(adjective, blank, aloof, moral)
2
amiable(adjective, calm, quiet, kind)
2
bland(adjective, calm, quiet, kind)
2
careless(adjective, feature, state, calm)
2
cold(adjective, calm, close, quiet)
2
earnest(adjective, calm, quiet, reasonable)
2
emotionless(adjective, blank, aloof, unemotional)
2
harmonious(adjective, calm, quiet, smooth)
2
immovable(adjective, calm, firm, solid)
2
inscrutable(adjective, quiet, moderate, gentle)
2
listless(adjective, calm, quiet, moderate)
2
poker-faced(adjective, calm, detached, blank)
2
somber(adjective, calm, quiet, reasonable)
2
unaffected(adjective, calm, unflappable)
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APASmart Define. (2015). serene thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serene/thesaurus/synonyms
ChicagoSmart Define. 2015. "serene thesaurus" https://smartdefine.org/serene/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, serene thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serene/thesaurus/synonyms>.
MLASmart Define. "serene thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/serene/thesaurus/synonyms>