81 entries under lethargic topic. ×

10
slothful(adjective, dull, quiet, easy, slow)
9
unresponsive(adjective, calm, dull, cool, slow)
7
insensible(adjective, cool, indifferent, feelings, blank)
7
lazy(adjective, dull, weak, easy, slow)
7
leaden(adjective, dull, quiet, weak, easy)
6
careless(adjective, dull, indifferent, sluggish, indifference)
6
heavy(adjective, dull, quiet, weak, easy)
6
lumpish(adjective, dull, slow, heavy, sluggish)
6
sleepy(adjective, quiet, easy, slow, relaxed)
6
spiritless(adjective, dull, cool, weak, easy)
6
supine(adjective, dull, quiet, weak, easy)
5
benumbed(adjective, unfeeling, numb, insensitive)
5
blah(adjective, calm, dull, weak, easy)
5
comatose(adjective, dull, weak, easy, slow)
5
drugged(adjective, insensibility)
4
dopey(adjective, dull, weak, easy, slow)
4
enervated(adjective, dull, weak, easy, slow)
4
inanimate(still, lifeless, languid, motionless)
4
leisurely(adjective, dull, quiet, weak, easy)
4
slack(adjective, dull, quiet, moderate, easy)
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APASmart Define. (2015). phlegmatic thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/phlegmatic/thesaurus/synonyms
ChicagoSmart Define. 2015. "phlegmatic thesaurus" https://smartdefine.org/phlegmatic/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, phlegmatic thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/phlegmatic/thesaurus/synonyms>.
MLASmart Define. "phlegmatic thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/phlegmatic/thesaurus/synonyms>