120 entries under dull topic. ×

4
leisurely(adjective, quiet, weak, easy)
4
slack(adjective, quiet, moderate, easy)
4
stupefied(adjective, stupid, idle, weary)
4
weary(adjective, weak, easy, slow)
3
dragging(adjective, slow, heavy, sluggish)
3
hebetudinous(adjective, slow, heavy, stupid)
3
laid-back(adjective, calm, quiet, weak)
3
matter-of-fact(adjective, calm, cool, simple)
3
somnolent(adjective, relaxed, stupid, weary)
3
unexcitable(adjective, calm, cool, detached)
3
unhurried(adjective, quiet, weak, easy)
2
debilitated(adjective, stupid, idle, weary)
2
dilatory(adjective, quiet, easy, heavy)
2
dormant(adjective, stupid, still, weary)
2
drooping(adjective, relaxed, sluggish, lazy)
2
easy(adjective, calm, quiet, weak)
2
heedless(adjective, indifferent, detached, distant)
2
moony(adjective, quiet, weak, easy)
2
obtuse(adjective, slow, stupid, impassive)
2
stagnant(adjective, quiet, moderate, easy)
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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>