7
stolid(adjective, calm, quiet, cool, relaxed)
7
unexcited(adjective, calm, quiet, cool, moderate)
7
unmoved(adjective, calm, quiet, cool, moderate)
6
assured(adjective, calm, quiet, cool, solid)
6
immovable(adjective, calm, cool, firm, solid)
6
poised(adjective, calm, quiet, cool, moderate)
6
still(adjective, calm, quiet, cool, moderate)
6
unaffected(adjective, calm, cool, collected, unflappable)
6
untouched(adjective, calm, cool, restrained, steady)
5
aloof(adjective, calm, quiet, cool, moderate)
5
comfortable(adjective, calm, peaceful, tranquil)
5
easygoing(adjective, calm, quiet, cool, mild)
5
equanimous(adjective, calm, cool, collected, unflappable)
5
level-headed(adjective, calm, cool, smooth, steady)
5
nerveless(adjective, calm, cool, collected, unflappable)
5
philosophical(adjective, calm, quiet, gentle, relaxed)
5
reserved(adjective, calm, cool, firm, sensible)
5
secure(adjective, firm, solid, certain, stable)
5
stable(adjective, calm, smooth, firm, solid)
4
balanced(adjective, firm, sensible, solid, steady)
11 years ago|10k views|share |citing 
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>