239 entries under severe topic. ×
| exacting(adjective, dull, hard, easy) | |
| hard-boiled(noun, adjective, mean, strong, hard) | |
| ruthless(adjective, strong, hard, rough) | |
| strict(adjective, strong, hard, easy) | |
| determined(adjective, clear, strong, hard) | |
| formidable(adjective, strong, difficulty, rough) | |
| insensitive(noun, adjective, mean, hard, cool) | |
| heavy(noun, adjective, good, person, dull) | |
| steadfast(adjective, calm, clear, strong) | |
| uphill(adjective, great, easy, rough) | |
| violent(adjective, clear, hard, rough) | |
| brutal(adjective, good, bad, hard, cool) | |
| cold(adjective, good, mean, bad, hard) | |
| heartless(adjective, mean, hard, cool) | |
| merciless(adjective, hard, rough, harsh) | |
| relentless(adjective, mean, strong, hard) | |
| rigorous(adjective, strong, hard, rough) | |
| staunch(adjective, calm, clear, strong, sound) | |
| unrelenting(adjective, mean, strong, hard) | |
| stringent(adjective, hard, firm, difficult) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |