280 entries under tough topic. ×
| solidified(adjective, set, firm, solid) | |
| wicked(adjective, mean, severe, evil) | |
| hard-core(adjective, strong, severe, firm) | |
| impenitent(adjective, harsh, careless, indifferent) | |
| impervious(adjective, set, firm, solid) | |
| indomitable(adjective, set, strong, great) | |
| insensate(adjective, severe, careless, indifferent) | |
| stiff-necked(adjective, mean, strong, harsh) | |
| unremitting(adjective, harsh, cruel, grim) | |
| astringent(adjective, strong, severe, sharp) | |
| barbarous(adjective, mean, severe, evil) | |
| cantankerous(adjective, mean, severe, evil) | |
| challenging(adjective, great, difficult, awkward) | |
| crusty(adjective, harsh, rude, coarse) | |
| forbidding(adjective, person, strong, severe) | |
| great(adjective, person, body, strong) | |
| hairy(adjective, mean, severe, sharp) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| murderous(adjective, harsh, cruel, grim) | |
| sour(adjective, severe, evil, sharp) |
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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> |