85 entries under quiet topic. ×

9
dispassionate(adjective, calm, cool, relaxed)
9
imperturbable(adjective, calm, cool, relaxed)
9
self-possessed(adjective, calm, relaxed, still)
9
serene(adjective, calm, cool, relaxed)
7
detached(adjective, calm, cool, relaxed)
7
leaden(adjective, dull, weak, easy)
6
flat(adjective, calm, tough, indifferent)
6
heavy(adjective, dull, weak, easy)
6
idle(adjective, easy, heavy, indifferent)
6
sleepy(adjective, easy, slow, relaxed)
6
supine(adjective, dull, weak, easy)
6
uninvolved(adjective, calm, indifferent, detached)
6
unruffled(adjective, calm, cool, smooth)
5
placid(adjective, calm, cool, smooth)
5
self-controlled(adjective, calm, cool, relaxed)
5
tranquil(adjective, calm, relaxed, still)
4
laggard(adjective, dull, easy, heavy)
4
leisurely(adjective, dull, weak, easy)
4
philosophical(adjective, calm, relaxed, casual)
4
resigned(adjective, calm, cool, indifferent)
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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>