367 entries under hard topic. ×
| indomitable(adjective, strong, great, difficult) | |
| thick(adjective, person, set, body, strong) | |
| unforgiving(adjective, rough, harsh, cruel) | |
| unkind(adjective, mean, cool, severe) | |
| vicious(adjective, rough, nasty, harsh) | |
| aloof(adjective, calm, mean, cool) | |
| concrete(adjective, solid, rigid, inflexible) | |
| drastic(adjective, rough, harsh, rude) | |
| extreme(adjective, harsh, rude, cruel) | |
| hard as nails(expression, adjective, idiom, strong) | |
| hardheaded(adjective, strong, determined, unreasonable) | |
| immovable(adjective, mean, strong, determined) | |
| inelastic(adjective, determined, resolute, rigid) | |
| mulish(adjective, mean, strong, firm) | |
| numb(noun, adjective, severe, cruel) | |
| refractory(adjective, rough, firm, grim) | |
| set in stone(expression, adjective, idiom, calm, mean) | |
| unconcerned(adjective, mean, cool, unpleasant) | |
| unmoved(adjective, calm, mean, cool) | |
| unshakable(adjective, mean, strong, firm) |
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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> |