367 entries under hard topic. ×
| rigorous(adjective, strong, severe, rough) | |
| unrelenting(adjective, mean, strong, severe) | |
| cool(adjective, calm, mean, bad, strong) | |
| intractable(adjective, rough, firm, difficult) | |
| stringent(adjective, severe, firm, difficult) | |
| austere(adjective, strong, severe, sharp) | |
| exhausting(adjective, dull, difficult, boring) | |
| hard-hearted(adjective, mean, severe, harsh) | |
| hard-line(adjective, characteristic, strong, rough) | |
| indifferent(adjective, calm, mean, cool) | |
| mean(noun, adjective, clear, cool) | |
| pitiless(adjective, severe, sharp, harsh) | |
| resistant(adjective, strong, fit, firm) | |
| thick-skinned(noun, adjective, mean, severe) | |
| toughened(noun, adjective, strong, careless) | |
| uncaring(adjective, mean, cool, severe) | |
| unsentimental(adjective, sharp, sensible, sober) | |
| unsparing(adjective, strong, severe, rough) | |
| dense(adjective, person, set, body, strong) | |
| hard-bitten(adjective, strong, continue, rough) |
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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> |