127 entries under persistent topic. ×
| obstinate(adjective, mean, hard, tough, moderate) | |
| harsh(adjective, mean, strong, hard, tough) | |
| stern(adjective, hard, tough, easy, severe) | |
| unbendable(adjective, firm, resist, determined, unreasonable) | |
| rigorous(adjective, strong, hard, tough, correct) | |
| constant(adjective, strain, still, fixed, firmness) | |
| steady(adjective, feature, state, characteristic, complete) | |
| adamantine(adjective, strong, hard, tough, severe) | |
| unwavering(adjective, determined, resolute, constant) | |
| fast(adjective, complete, secure, strain, firm) | |
| enduring(adjective, strain, firm, fixed, stiff) | |
| exacting(adjective, hard, tough, easy, severe) | |
| stringent(adjective, hard, tough, severe, rough) | |
| iron(adjective, mean, strong, hard, tough) | |
| demanding(adjective, hard, tough, easy, severe) | |
| implacable(adjective, mean, strong, hard, tough) | |
| resolved(adjective, severe, harsh, cruel, determined) | |
| tenacious(adjective, determined, resolute, obstinate) | |
| grim(adjective, strong, hard, tough, severe) | |
| dogged(adjective, mean, hard, harsh, cruel) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 21 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |