126 entries under sober topic. ×
| factual(adjective, tough, rational, straightforward) | |
| farsighted(adjective, reasonable, keen, deep, rational) | |
| feasible(adjective, tough, rational, straightforward) | |
| fixed(adjective, firm, determined, resolute) | |
| flat(adjective, tough, rational, straightforward) | |
| hard-boiled(adjective, calm, strong, hard, tough) | |
| impersonal(adjective, tough, rational, straightforward) | |
| levelheaded(adjective, calm, reasonable, sensible, dark) | |
| lifeless(adjective, tough, rational, straightforward) | |
| logical(adjective, reasonable, keen, sensible, deep) | |
| lost in thought(expression, adjective, idiom, reasonable, thoughtful) | |
| low-key(adjective, calm, quiet, gentle, sensible) | |
| mean business(expression, adjective, resolute, persistent) | |
| mundane(adjective, tough, rational, straightforward) | |
| naked(adjective, tough, rational, straightforward) | |
| objective(adjective, tough, rational, straightforward) | |
| philosophic(adjective, reasonable, keen, deep, rational) | |
| phlegmatic(adjective, tough, rational, straightforward) | |
| plain(adjective, calm, open, tough, honest) | |
| playing hard ball(expression, adjective, idiom, great, heavy) |
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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> |