3
solemn(adjective, calm, cool, sensible, dark)
3
solid(adjective, firm, certain, stable, fixed)
3
sound(adjective, calm, firm, sensible, solid)
3
together(adjective, calm, quiet, relaxed, casual)
3
unimpassioned(adjective, calm, sensible, dark, restrained)
3
unshaken(adjective, firm, solid, stable, fixed)
2
pacific(adjective, calm, quiet, cool, sensible)
2
casual(adjective, calm, cool, relaxed, restrained)
2
firm(adjective, solid, stable, fixed, sturdy)
2
hard-boiled(adjective, calm, sensible, dark, cold)
2
hardened(adjective, cool, cold, cruel, blank)
2
inactive(adjective, quiet, cool, still, peaceful)
2
insensitive(adjective, unfeeling, unsympathetic, pitiless, hardhearted)
2
insouciant(adjective, calm, cool, relaxed, casual)
2
meek(adjective, calm, quiet, gentle, restrained)
2
neutral(adjective, calm, quiet, cool, moderate)
2
numb(adjective, unexcitable)
2
poker-faced(adjective, calm, cool, detached, blank)
2
practical(adjective, calm, sensible, dark, restrained)
2
reposeful(adjective, quiet, cool, still, peaceful)
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APASmart Define. (2015). imperturbable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/imperturbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "imperturbable thesaurus" https://smartdefine.org/imperturbable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, imperturbable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/imperturbable/thesaurus/synonyms>.
MLASmart Define. "imperturbable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/imperturbable/thesaurus/synonyms>