84 entries under rational topic. ×
| emotionless(adjective, tough, straightforward, sober) | |
| engrossed(adjective, reasonable, keen, deep) | |
| factual(adjective, tough, straightforward, sober) | |
| farsighted(adjective, reasonable, keen, deep) | |
| feasible(adjective, tough, straightforward, sober) | |
| flat(adjective, tough, straightforward, sober) | |
| hard-boiled(adjective, calm, strong, hard, tough) | |
| hardheaded(adjective, strong, hard, tough, severe) | |
| impersonal(adjective, tough, straightforward, sober) | |
| inhibited(adjective, calm, sensible, dark, restrained) | |
| levelheaded(adjective, calm, reasonable, sensible, dark) | |
| lifeless(adjective, tough, straightforward, sober) | |
| matter-of-fact(adjective, straightforward, practical, realistic) | |
| mundane(adjective, tough, straightforward, sober) | |
| naked(adjective, tough, straightforward, sober) | |
| objective(adjective, tough, straightforward, sober) | |
| philosophic(adjective, reasonable, keen, deep) | |
| phlegmatic(adjective, tough, straightforward, sober) | |
| plain(adjective, calm, open, tough, honest) | |
| pragmatic(adjective, tough, straightforward, sober) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |