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12
serious(adjective, severe, grim, somber)
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APASmart Define. (2015). unsmiling thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unsmiling/thesaurus/synonyms
ChicagoSmart Define. 2015. "unsmiling thesaurus" https://smartdefine.org/unsmiling/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, unsmiling thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unsmiling/thesaurus/synonyms>.
MLASmart Define. "unsmiling thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/unsmiling/thesaurus/synonyms>