92 entries under impassive topic. ×

1
hard-hearted(adjective, indifferent, detached, unsympathetic)
1
impersonal(adjective, cool, tough, rational, straightforward)
1
inexpressive(adjective, cool, detached, blank, aloof)
1
marble(adjective, detached, unresponsive, laid-back)
1
naked(adjective, dull, simple, tough, rational)
1
not responsive(expression, adjective, detached, unresponsive)
1
obdurate(adjective, detached, unresponsive, laid-back)
1
objective(adjective, tough, indifferent, rational, straightforward)
1
plain(adjective, dull, simple, tough, rational)
1
poker-faced(adjective, quiet, cool, indifferent, detached)
1
practical(adjective, tough, rational, straightforward, sober)
1
pragmatic(adjective, tough, rational, straightforward, sober)
1
prosaic(adjective, tough, rational, straightforward, sober)
1
prosy(adjective, tough, rational, straightforward, sober)
1
reticent(adjective, cool, restrained, detached, unfriendly)
1
rolling with the punches(expression, adjective, idiom, detached)
1
serious(adjective, tough, rational, straightforward, sober)
1
sober(adjective, calm, cool, tough, rational)
1
stupid(dull, slow, unresponsive, lethargic)
1
thick-skinned(adjective, detached, unresponsive, laid-back)
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APASmart Define. (2015). phlegmatic thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/phlegmatic/thesaurus/synonyms
ChicagoSmart Define. 2015. "phlegmatic thesaurus" https://smartdefine.org/phlegmatic/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, phlegmatic thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/phlegmatic/thesaurus/synonyms>.
MLASmart Define. "phlegmatic thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/phlegmatic/thesaurus/synonyms>