52 entries under firm topic. ×
| intractable(adjective, tough, unreasonable, grim) | |
| single-minded(adjective, tough, unreasonable, grim) | |
| stiff-necked(adjective, mean, hard, tough) | |
| tough(adjective, mean, strong, hard) | |
| compact(adjective, set, strong, hard) | |
| dogged(adjective, mean, strong, hard, tough) | |
| durable(adjective, stiff, rigid) | |
| recalcitrant(tough, persistent, obstinate, stubborn) | |
| rocky(adjective, set, strong, stiff) | |
| solid(adjective, set, strong, hard, tough) | |
| thick(adjective, strong, hard, tough) | |
| bound(verb, adjective, strong, tough) | |
| callous(adjective, set, mean, strong, hard) | |
| fixed(adjective, mean, strong, hard, tough) | |
| mulish(adjective, mean, strong, hard, tough) | |
| perverse(adjective, mean, hard, tough) | |
| pigheaded(adjective, mean, hard, tough) | |
| rocklike(adjective, stiff, rigid, steel) | |
| staunch(adjective, set, strong, hard, tough) | |
| stony(adjective, set, strong, hard) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |