2
self-assured(adjective, calm, solid, relaxed, certain)
2
steadfast(adjective, firm, sensible, solid, steady)
2
stony(adjective, cool, unfriendly, aloof, distant)
2
stony-hearted(adjective, cold, cruel, unfeeling, unsympathetic)
2
thoughtful(somber, solemn)
2
unfeeling(adjective, calm, cool, relaxed, cold)
2
unpassionate
2
unresponsive(adjective, calm, cool, restrained, unfriendly)
2
unsympathetic(adjective, cool, unfriendly, aloof, distant)
2
unwavering(adjective, firm, sensible, solid, steady)
1
deliberate(adjective, calm, quiet, cool, relaxed)
1
fast(adjective, firm, sensible, solid, steady)
1
possessed(adjective, calm, relaxed, tranquil, easygoing)
1
soft(adjective, calm, sensible, restrained, thoughtful)
1
substantial(adjective, firm, solid, stable, fixed)
1
abnegating(adjective, calm, sensible, dark, restrained)
1
abstract(adjective, calm, detached, sober, unfeeling)
1
accommodating(adjective, calm, quiet, gentle, restrained)
1
amiable(adjective, quiet, cool, moderate, gentle)
1
amicable(adjective, quiet, cool, moderate, gentle)
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APASmart Define. (2015). imperturbable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/imperturbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "imperturbable thesaurus" https://smartdefine.org/imperturbable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, imperturbable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/imperturbable/thesaurus/synonyms>.
MLASmart Define. "imperturbable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/imperturbable/thesaurus/synonyms>