80 entries under impassive topic. ×

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reasonable(adjective, calm, restrained, subdued)
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reserved(adjective, calm, restrained, subdued)
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restrained(adjective, calm, subdued, unresponsive)
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sedate(adjective, calm, restrained, subdued)
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serene(adjective, calm, restrained, peaceful, subdued)
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serious(adjective, calm, restrained, subdued)
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severe(adjective, calm, restrained, subdued)
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soft(adjective, calm, restrained, subdued)
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solemn(adjective, calm, restrained, subdued)
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somber(adjective, calm, restrained, subdued)
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sound(adjective, calm, restrained, unconcerned, flawless)
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staid(adjective, calm, restrained, subdued)
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staunch(adjective, cold, indifferent, steadfast)
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steadfast(adjective, cold, indifferent, unyielding)
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stoical(adjective, cold, indifferent, steadfast)
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subdued(adjective, calm, restrained, unresponsive)
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tepid(adjective, calm, restrained, subdued)
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toned down(expression, adjective, calm, restrained, subdued)
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unenthusiastic(adjective, calm, restrained, subdued)
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unshaken(adjective, cold, indifferent, steadfast)
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APASmart Define. (2015). unstirred thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unstirred/thesaurus/synonyms
ChicagoSmart Define. 2015. "unstirred thesaurus" https://smartdefine.org/unstirred/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, unstirred thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unstirred/thesaurus/synonyms>.
MLASmart Define. "unstirred thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/unstirred/thesaurus/synonyms>