84 entries under rational 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) | |
| sober(adjective, calm, dull, quiet, cool) | |
| sedate(adjective, calm, dull, cool, severe) | |
| staid(adjective, calm, dull, set, cool) | |
| no-nonsense(adjective, calm, dull, work, open) | |
| composed(adjective, calm, cool, sensible, dark) | |
| ruminative(adjective, reasonable, thoughtful, sober) | |
| somber(adjective, calm, dull, cool, severe) | |
| calm(adjective, cool, tough, sensible, relaxed) | |
| collected(adjective, calm, cool, dark, relaxed) | |
| drab(adjective, calm, dull, sensible, dark) | |
| straightforward(open, honest, true, straight) | |
| dull(adjective, tough, severe, dark, gloomy) | |
| imperturbable(adjective, calm, cool, sensible, dark) | |
| practical(adjective, calm, tough, plain, dark) | |
| sensible(adjective, calm, relaxed, pure) | |
| sound(adjective, calm, strong, honest, solid) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 23 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |