126 entries under sober topic. ×
| ruminative(adjective, reasonable, rational, thoughtful) | |
| somber(adjective, calm, dull, cool, severe) | |
| pensive(adjective, set, keen, unhappy, gloomy) | |
| austere(adjective, set, strong, hard, tough) | |
| deliberate(adjective, calm, set, cool, severe) | |
| demure(adjective, calm, cool, modest, shy) | |
| reflective(adjective, set, deep, thoughtful) | |
| resolved(adjective, severe, firm, harsh, cruel) | |
| calm(adjective, cool, tough, sensible, relaxed) | |
| funereal(adjective, dull, dark, gloomy) | |
| contemplative(adjective, reasonable, thoughtful, thinking) | |
| collected(adjective, calm, cool, dark, relaxed) | |
| cool(adjective, calm, sensible, unusual, relaxed) | |
| firm(adjective, strong, hard, tough, severe) | |
| set(adjective, strong, severe, firm, thoughtful) | |
| cogitative(adjective, reasonable, keen, deep, thoughtful) | |
| dull(adjective, tough, severe, dark, gloomy) | |
| lugubrious(adjective, dull, dark, gloomy, melancholy) | |
| musing(adjective, reasonable, keen, deep, thoughtful) | |
| practical(adjective, calm, tough, plain, dark) |
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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> |