226 entries under hard topic. ×
| obstinate(adjective, mean, tough, moderate) | |
| harsh(adjective, mean, strong, tough) | |
| unshakable(adjective, mean, determined, unreasonable) | |
| stern(adjective, tough, easy, severe) | |
| rigorous(adjective, strong, tough, correct) | |
| refractory(adjective, tough, strain, firm) | |
| hard-nosed(adjective, mean, strong, tough) | |
| adamantine(adjective, strong, tough, severe) | |
| tough(adjective, mean, strong, easy) | |
| austere(adjective, strong, tough, severe) | |
| solid(adjective, strong, complete, secure) | |
| exacting(adjective, tough, easy, severe) | |
| robust(adjective, strong, tough, strain) | |
| stringent(adjective, tough, severe, rough) | |
| inelastic(adjective, tough, severe, firm) | |
| set in stone(expression, adjective, idiom, mean) | |
| iron(adjective, mean, strong, tough) | |
| precise(adjective, correct, severe, rough) | |
| demanding(adjective, tough, easy, severe) | |
| implacable(adjective, mean, strong, tough) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 24 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |