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| unwarmhearted(noun, stern, humorless, unsmiling) |
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| APA | Smart Define. (2015). grim-faced thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/grim-faced/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "grim-faced thesaurus" https://smartdefine.org/grim-faced/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, grim-faced thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/grim-faced/thesaurus/synonyms>. |
| MLA | Smart Define. "grim-faced thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/grim-faced/thesaurus/synonyms> |