918 entries under adjective topic. ×
| fell(unpleasant, heavy, important, significant) | |
| fervid(keen, intense, passionate, enthusiastic) | |
| firm(strong, hard, tough, severe) | |
| formal | |
| full | |
| grim-faced | |
| grim-visaged | |
| gross(bad, offensive, foul, obvious) | |
| honorable(honest, straight, grand, upright) | |
| hot(great, keen, warm, intense) | |
| long-faced(somber, dejection, humorless) | |
| majestic | |
| meditative(set, thoughtful, thinking, stern) | |
| no joke(expression, idiom, dullness, weighty) | |
| no laughing matter(expression, idiom, weighty, aper) | |
| persevering(strong, firm, determined, resolute) | |
| persistent(strong, firm, determined, bold) | |
| real(open, warm, honest, total) | |
| relentless(close, strong, hard, tough) | |
| rigid(strong, hard, tough, severe) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 27 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |