100 entries under restrained topic. ×

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eschewing(adjective, calm, sensible, dark)
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forgoing(adjective, calm, sensible, dark)
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hard-hearted(adjective, calm, subdued, impassive)
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hushed(quiet, gentle)
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impervious(adjective, calm, subdued, impassive)
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indifferent(adjective, calm, subdued, impassive)
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inobtrusive(quiet, gentle)
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laid-back(adjective, calm, cool, subdued)
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low(adjective, quiet, gentle, unhappy, unpleasant)
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lucid(adjective, calm, sensible, dark)
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lukewarm(adjective, calm, subdued, impassive)
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mellow(quiet, gentle)
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moderated(quiet, gentle)
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muted(quiet, gentle)
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neutral(quiet, gentle)
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not influenced(expression, adjective, calm, subdued)
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out of spirits(expression, idiom, quiet, gentle)
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pacific(adjective, calm, sensible, alert)
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peaceful dull(expression, calm, sensible, dark)
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proof(adjective, calm, subdued, impassive)
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APASmart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>