90 entries under straightforward topic. ×
| earnest(noun, adjective, calm, dull, work) | |
| sober(adjective, calm, dull, quiet, cool) | |
| sincere(noun, adjective, open, keen, warm) | |
| no-nonsense(adjective, calm, dull, work, open) | |
| honest(adjective, set, open, true, natural) | |
| genuine(adjective, set, open, honest, total) | |
| heartfelt(adjective, open, keen, warm, honest) | |
| wholehearted(adjective, open, keen, warm, honest) | |
| calm(adjective, cool, tough, sensible, relaxed) | |
| devout(adjective, open, keen, warm, honest) | |
| faithful(adjective, open, firm, honest, true) | |
| real(adjective, open, warm, honest, total) | |
| true(adjective, strong, open, warm, firm) | |
| dear(adjective, open, honest, true) | |
| dull(adjective, tough, severe, dark, gloomy) | |
| practical(adjective, calm, tough, plain, dark) | |
| sensible(adjective, calm, relaxed, pure, rational) | |
| deadpan(adjective, set, tough, severe, honest) | |
| impassive(adjective, calm, tough, restrained, rational) | |
| rational(adjective, calm, reasonable, keen, dark) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 24 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |