127 entries under indifferent topic. ×

31
apathetic(adjective, calm, dull, quiet, cool)
25
listless(adjective, calm, dull, quiet, weak)
20
cool(adjective, calm, quiet, relaxed)
18
impassive(adjective, calm, dull, quiet, cool)
17
lackadaisical(adjective, dull, quiet, weak, easy)
16
stolid(adjective, calm, dull, quiet, cool)
15
nonchalant(adjective, calm, quiet, cool, relaxed)
15
unconcerned(adjective, calm, dull, cool, weak)
15
unemotional(adjective, calm, dull, quiet, cool)
13
cold(adjective, calm, cool, tough)
12
inert(adjective, dull, quiet, weak, moving)
12
insouciant(adjective, dull, unsympathetic, sluggish)
12
uninterested(adjective, dull, cool, weak, easy)
11
inactive(adjective, dull, quiet, weak, easy)
11
lifeless(adjective, calm, quiet, tough, slow)
11
lukewarm(adjective, dull, cool, restrained)
9
dispassionate(adjective, calm, quiet, cool, relaxed)
9
serene(adjective, calm, quiet, cool, relaxed)
9
uncaring(adjective, detached, unfriendly, distant)
9
unmoved(adjective, calm, cool, detached)
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APASmart Define. (2015). phlegmatic thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/phlegmatic/thesaurus/synonyms
ChicagoSmart Define. 2015. "phlegmatic thesaurus" https://smartdefine.org/phlegmatic/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, phlegmatic thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/phlegmatic/thesaurus/synonyms>.
MLASmart Define. "phlegmatic thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/phlegmatic/thesaurus/synonyms>