84 entries under rational topic. ×
| deadpan(adjective, set, tough, severe, honest) | |
| deliberative(adjective, reasonable, keen, deep) | |
| impassive(adjective, calm, tough, restrained) | |
| keen(adjective, reasonable, sensible, passionate, deep) | |
| museful(adjective, reasonable, keen, deep) | |
| realistic(adjective, calm, tough, sensible, dark) | |
| reflecting(adjective, reasonable, keen, deep) | |
| stolid(adjective, tough, straightforward, sober) | |
| unemotional(adjective, straightforward, down-to-earth) | |
| abstaining(adjective, calm, sensible, dark, restrained) | |
| analytical(adjective, reasonable, keen, deep) | |
| apathetic(adjective, tough, straightforward, sober) | |
| calculating(adjective, reasonable, keen, deep) | |
| cerebral(adjective, reasonable, keen, deep) | |
| clear-headed(adjective, calm, sensible, dark, restrained) | |
| cold(adjective, calm, close, hard, tough) | |
| cold-blooded(adjective, tough, straightforward, sober) | |
| down-to-earth(adjective, calm, tough, plain, restrained) | |
| dry(adjective, tough, straightforward, temperate) | |
| earthy(adjective, tough, straightforward, sober) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 25 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |