89 entries under nonchalant topic. ×

10
imperturbable(adjective, calm, quiet, cool, moderate)
10
incurious(adjective, calm, cool, concern, attitude)
10
placid(adjective, calm, quiet, cool, moderate)
9
insensitive(adjective, person, hard, indifferent, feelings)
9
insouciant(adjective, calm, cool, relaxed, indifferent)
9
serene(adjective, calm, quiet, cool, moderate)
9
stolid(adjective, calm, quiet, cool, relaxed)
9
unruffled(adjective, calm, quiet, cool, moderate)
8
casual(adjective, calm, quiet, cool, relaxed)
8
collected(adjective, calm, quiet, cool, moderate)
8
heedless(noun, adjective, indifferent, distant, apathetic)
8
unflappable(adjective, calm, quiet, cool, moderate)
7
careless(noun, adjective, calm, cool, relaxed)
7
easygoing(adjective, calm, quiet, cool, mild)
7
oblivious(noun, adjective, indifferent, unsympathetic, inattentive)
7
phlegmatic(adjective, calm, quiet, cool, relaxed)
7
tranquil(adjective, calm, quiet, cool, mild)
6
callous(adjective, indifferent, unfriendly, distant, apathetic)
6
undisturbed(adjective, quiet, cool, moderate, gentle)
6
unperturbed(adjective, calm, cool, relaxed, indifferent)
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APASmart Define. (2016). detached thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/detached/thesaurus/synonyms
ChicagoSmart Define. 2016. "detached thesaurus" https://smartdefine.org/detached/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, detached thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/detached/thesaurus/synonyms>.
MLASmart Define. "detached thesaurus" 23 March 2016. Web. 25 September 2026. <https://smartdefine.org/detached/thesaurus/synonyms>