5
aloof(adjective, calm, cool, indifferent, restrained)
5
benumbed(adjective, unfeeling, numb, insensitive, lethargic)
5
blah(adjective, calm, dull, weak, easy)
5
comatose(adjective, dull, weak, easy, slow)
5
drugged(adjective, lethargic, insensibility)
5
emotionless(adjective, calm, dull, cool, tough)
5
half-hearted(adjective, indifference, insensibility)
5
incurious(adjective, indifferent, feelings, restrained, apathetic)
5
placid(adjective, calm, quiet, cool, smooth)
5
self-controlled(adjective, calm, quiet, cool, relaxed)
5
tranquil(adjective, calm, quiet, relaxed, still)
5
undisturbed(adjective, calm, smooth, indifferent, still)
5
unperturbed(adjective, indifferent, unsympathetic, inattentive, uninterested)
4
dense(adjective, dull, slow, stupid, impassive)
4
distant(adjective, cool, indifferent, restrained, detached)
4
dopey(adjective, dull, weak, easy, slow)
4
dry(adjective, calm, dull, cool, tough)
4
enervated(adjective, dull, weak, easy, slow)
4
groggy(adjective, calm, unemotional, composed)
4
inanimate(still, lifeless, lethargic, languid, motionless)
11 years ago|17k views|share |citing 
APASmart Define. (2015). phlegmatic thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/phlegmatic/thesaurus/synonyms
ChicagoSmart Define. 2015. "phlegmatic thesaurus" https://smartdefine.org/phlegmatic/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, phlegmatic thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/phlegmatic/thesaurus/synonyms>.
MLASmart Define. "phlegmatic thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/phlegmatic/thesaurus/synonyms>