183 entries under firm topic. ×
| stern(adjective, hard, tough, easy, severe) | |
| unbendable(adjective, resist, determined, unreasonable) | |
| rigorous(adjective, strong, hard, tough, correct) | |
| tight(adjective, close, strong, secure, severe) | |
| refractory(adjective, hard, tough, strain) | |
| resistant(adjective, strong, strain, stiff) | |
| steady(adjective, feature, state, characteristic, complete) | |
| adamantine(adjective, strong, hard, tough, severe) | |
| durable(adjective, strong, strain, stiff) | |
| tough(adjective, mean, strong, hard, easy) | |
| fast(adjective, complete, secure, strain) | |
| austere(adjective, strong, hard, tough, severe) | |
| solid(adjective, strong, hard, complete, secure) | |
| enduring(adjective, strain, fixed, stiff) | |
| exacting(adjective, hard, tough, easy, severe) | |
| stringent(adjective, hard, tough, severe, rough) | |
| inelastic(adjective, hard, tough, severe) | |
| set in stone(expression, adjective, idiom, mean, hard) | |
| iron(adjective, mean, strong, hard, tough) | |
| strait-laced(adjective, tough, correct, severe) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |