191 entries under tough topic. ×
| adamant(adjective, mean, strong, hard) | |
| obstinate(adjective, mean, hard, moderate) | |
| harsh(adjective, mean, strong, hard) | |
| stern(adjective, hard, easy, severe) | |
| rigorous(adjective, strong, hard, correct) | |
| refractory(adjective, hard, strain, firm) | |
| hard-nosed(adjective, mean, strong, hard) | |
| adamantine(adjective, strong, hard, severe) | |
| austere(adjective, strong, hard, severe) | |
| solid(adjective, strong, hard, complete, secure) | |
| exacting(adjective, hard, easy, severe) | |
| robust(adjective, strong, hard, strain) | |
| stringent(adjective, hard, severe, rough) | |
| inelastic(adjective, hard, severe, firm) | |
| set in stone(expression, adjective, idiom, mean, hard) | |
| iron(adjective, mean, strong, hard) | |
| strait-laced(adjective, correct, severe, firm) | |
| demanding(adjective, hard, easy, severe) | |
| formal(adjective, correct, severe, firm) | |
| implacable(adjective, mean, strong, hard) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 27 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |