95 entries under strong topic. ×
| ferric(adjective, hard, tough, sturdy) | |
| ferrous(adjective, hard, tough, sturdy) | |
| fibrous(adjective, hard, solid, stiff) | |
| healthy(adjective, hard, solid, stiff) | |
| indigestible(adjective, hard, solid, stiff) | |
| insensible(adjective, hard, tough, sturdy) | |
| lusty(adjective, hard, solid, stiff) | |
| molded(adjective, hard, solid, stiff) | |
| rock hard(expression, adjective, hard, tough) | |
| rocky(adjective, set, hard, firm) | |
| seasoned(adjective, hard, solid, stiff) | |
| steel(adjective, hard, tough, sturdy) | |
| steeled(adjective, hard, solid, stiff) | |
| tough as nails(expression, adjective, idiom, hard) | |
| tough inflexible(expression, hard, tough, sturdy) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 26 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |