142 entries under grim topic. ×
| merciless(adjective, hard, severe, rough, harsh) | |
| relentless(adjective, mean, strong, hard, severe) | |
| rigorous(adjective, strong, hard, severe, rough) | |
| unrelenting(adjective, mean, strong, hard, severe) | |
| intractable(adjective, hard, rough, firm, difficult) | |
| stringent(adjective, hard, severe, firm, difficult) | |
| austere(adjective, strong, hard, severe, sharp) | |
| hard-hearted(adjective, mean, hard, severe, harsh) | |
| persistent(adjective, firm, unreasonable, resolute) | |
| pitiless(adjective, hard, severe, sharp, harsh) | |
| thick-skinned(noun, adjective, mean, hard, severe) | |
| tiring(adjective, dull, difficult, boring) | |
| unsparing(adjective, strong, hard, severe, rough) | |
| inexorable(adjective, mean, strong, hard, firm) | |
| tyrannical(adjective, hard, harsh, cruel) | |
| wearisome(adjective, dull, severe, difficult, boring) | |
| cold-blooded(adjective, calm, mean, hard, cool) | |
| headstrong(adjective, hard, rough, firm, difficult) | |
| implacable(adjective, mean, strong, hard, firm) | |
| inhuman(adjective, hard, severe, harsh, violent) |
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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> |