28 entries under stiff topic. ×
| iron(adjective, set, strong, hard, firm) | |
| rocklike(adjective, firm, rigid) | |
| rocky(adjective, set, strong, hard, firm) | |
| stony(adjective, set, strong, hard, firm) | |
| strong(adjective, close, set, hard, firm) | |
| tough(adjective, firm, rigid, stubborn) | |
| unbreakable(adjective, firm, rigid) | |
| unyielding(adjective, firm, rigid) |
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| APA | Smart Define. (2015). packed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/packed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "packed thesaurus" https://smartdefine.org/packed/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, packed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/packed/thesaurus/synonyms>. |
| MLA | Smart Define. "packed thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/packed/thesaurus/synonyms> |