119 entries under severe topic. ×
| fatiguing(adjective, tough, rough, difficult) | |
| flinty(adjective, close, strong, hard, tough) | |
| hang-tough(adjective, strong, hard, tough) | |
| hard-boiled(adjective, calm, strong, hard, tough) | |
| hard-core(adjective, strong, hard, tough) | |
| hard-line(adjective, strong, hard, tough) | |
| hard-shell(adjective, strong, hard, tough) | |
| hardheaded(adjective, strong, hard, tough) | |
| inflexible(adjective, strong, hard, tough) | |
| irksome(adjective, tough, rough, difficult) | |
| labored(adjective, hard, tough, rough) | |
| merciless(adjective, tough, rough, difficult) | |
| mortified(adjective, strong, hard, tough) | |
| mulish(adjective, strong, hard, tough) | |
| obdurate(adjective, close, strong, hard, tough) | |
| stiff-necked(adjective, strong, hard, tough) | |
| tiring(adjective, tough, rough, difficult) | |
| troublesome(adjective, hard, tough, rough) | |
| unfortunate(adjective, intense, unhappy, gloomy) | |
| unrelenting(adjective, close, strong, hard, tough) |
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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> |