100 entries under restrained topic. ×
| grave(adjective, calm, dull, quiet, help) | |
| severe(adjective, calm, help, bad, strong) | |
| solemn(adjective, calm, dull, quiet, cool) | |
| earnest(noun, adjective, calm, dull, work) | |
| sad(adjective, hard, difficult, complex, importance) | |
| sober(adjective, calm, dull, quiet, cool) | |
| sedate(adjective, calm, dull, cool, severe) | |
| staid(adjective, calm, dull, set, cool) | |
| steady(adjective, calm, set, cool, firm) | |
| no-nonsense(adjective, calm, dull, work, open) | |
| composed(adjective, calm, cool, sensible, dark) | |
| somber(adjective, calm, dull, cool, severe) | |
| calm(adjective, cool, tough, sensible, relaxed) | |
| collected(adjective, calm, cool, dark, relaxed) | |
| cool(adjective, calm, sensible, unusual, relaxed) | |
| drab(adjective, calm, dull, sensible, dark) | |
| serene(adjective, calm, cool, sensible, relaxed) | |
| subdued(adjective, calm, quiet, severe, gentle) | |
| unruffled(adjective, calm, cool, relaxed) | |
| controlled(adjective, quiet, gentle, temperate) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 24 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |