119 entries under severe topic. ×
| strenuous(adjective, hard, rough, difficult) | |
| firm(adjective, strong, hard, tough) | |
| relentless(adjective, close, strong, hard, tough) | |
| rigid(adjective, strong, hard, tough) | |
| set(adjective, strong, firm, thoughtful) | |
| subdued(adjective, calm, quiet, gentle) | |
| violent(adjective, hard, rough, difficult) | |
| capital(adjective, important, significant, critical) | |
| dull(adjective, tough, dark, gloomy) | |
| frowning(adjective, strong, hard, tough) | |
| poor(adjective, intense, extreme, grave) | |
| quiet(adjective, calm, cool, gentle) | |
| unbending(adjective, close, strong, hard, tough) | |
| unyielding(adjective, strong, hard, tough) | |
| bullheaded(adjective, strong, hard, tough) | |
| deadpan(adjective, set, tough, honest) | |
| dreadful(adjective, intense, unpleasant, horrible) | |
| forbidding(adjective, close, strong, hard, tough) | |
| harsh(adjective, strong, hard, tough) | |
| hazardous(adjective, bad, heavy, significant) |
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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> |