90 entries under rigid topic. ×
| implacable(adjective, strong, hard, tough, sturdy) | |
| indomitable(adjective, strong, hard, tough, sturdy) | |
| indurated(adjective, firm, stiff) | |
| inexorable(adjective, strong, hard, tough, sturdy) | |
| obdurate(adjective, strong, hard, tough, sturdy) | |
| relentless(adjective, strong, hard, tough, sturdy) | |
| rocky(adjective, firm, stiff) | |
| tough inflexible(expression, strong, hard, tough, sturdy) | |
| unbendable(adjective, firm, inflexible, unbending) | |
| unbreakable(adjective, firm, stiff) |
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| APA | Smart Define. (2016). thick thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/thick/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "thick thesaurus" https://smartdefine.org/thick/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, thick thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/thick/thesaurus/synonyms>. |
| MLA | Smart Define. "thick thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/thick/thesaurus/synonyms> |