97 entries under thoughtful topic. ×
| ruminative(adjective, reasonable, rational, sober) | |
| somber(adjective, calm, dull, cool, severe) | |
| pensive(adjective, set, keen, unhappy, gloomy) | |
| austere(adjective, set, strong, hard, tough) | |
| genuine(adjective, set, open, honest, total) | |
| deliberate(adjective, calm, set, cool, severe) | |
| reflective(adjective, set, deep, sober) | |
| resolved(adjective, severe, firm, harsh, cruel) | |
| contemplative(adjective, reasonable, sober, thinking) | |
| meditative(adjective, set, thinking, stern) | |
| set(adjective, strong, severe, firm) | |
| careful(adjective, regular, practical, competent) | |
| cogitative(adjective, reasonable, keen, deep) | |
| diligent(adjective, resolute, practical, controlled) | |
| musing(adjective, reasonable, keen, deep) | |
| quiet(adjective, calm, cool, severe, gentle) | |
| thorough(adjective, deep, resolute, practical) | |
| wistful(adjective, reasonable, keen, unhappy, gloomy) | |
| abstruse(intense, heavy, deep, fierce) | |
| assiduous(adjective, reflective) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 28 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |