280 entries under tough topic. ×
| grim(adjective, person, mean, strong) | |
| stony(adjective, mean, cool, severe) | |
| merciless(adjective, mean, severe, evil) | |
| strict(adjective, strong, easy, severe) | |
| flinty(adjective, strong, severe, evil) | |
| heartless(adjective, person, mean, feeling, cool) | |
| insensitive(adjective, person, mean, cool) | |
| onerous(adjective, dull, great, severe) | |
| rigorous(adjective, strong, severe, rough) | |
| troublesome(adjective, evil, difficulty, rough) | |
| cold-blooded(adjective, person, mean, cool) | |
| hardened(adjective, severe, firm, attitude) | |
| ruthless(adjective, mean, severe, evil) | |
| strenuous(adjective, dull, great, severe) | |
| unkind(adjective, person, mean, cool) | |
| exacting(adjective, dull, easy, severe) | |
| obstinate(adjective, mean, rough, harsh) | |
| unbending(adjective, mean, strong, severe) | |
| unrelenting(adjective, mean, strong, severe) | |
| impenetrable(adjective, characteristic, firm, solid) |
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| APA | Smart Define. (2016). hard thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/hard/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "hard thesaurus" https://smartdefine.org/hard/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, hard thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard/thesaurus/synonyms>. |
| MLA | Smart Define. "hard thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/hard/thesaurus/synonyms> |