95 entries under restrained topic. ×

4
reasonable(adjective, calm, sensible, thoughtful)
4
thick-skinned(adjective, calm, cool, steady)
4
unconcerned(adjective, calm, quiet, cool, moderate)
3
grave(adjective, calm, cool, sensible, dark)
3
callous(adjective, calm, cool, cold, cruel)
3
cold(adjective, calm, cool, dark, relaxed)
3
disciplined(adjective, calm, sensible, dark)
3
enduring(adjective, calm, quiet, cool, gentle)
3
laid-back(adjective, calm, quiet, cool, moderate)
3
mild(adjective, calm, quiet, cool, gentle)
3
rational(adjective, calm, sensible, dark)
3
realistic(adjective, calm, sensible, dark)
3
serious(adjective, calm, cool, sensible, dark)
3
solemn(adjective, calm, cool, sensible, dark)
3
sound(adjective, calm, firm, sensible, solid)
3
unimpassioned(adjective, calm, sensible, dark)
2
pacific(adjective, calm, quiet, cool, sensible)
2
casual(adjective, calm, cool, relaxed)
2
hard-boiled(adjective, calm, sensible, dark, cold)
2
meek(adjective, calm, quiet, gentle)
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APASmart Define. (2015). imperturbable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/imperturbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "imperturbable thesaurus" https://smartdefine.org/imperturbable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, imperturbable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/imperturbable/thesaurus/synonyms>.
MLASmart Define. "imperturbable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/imperturbable/thesaurus/synonyms>