52 entries under firm topic. ×
| unyielding(adjective, characteristic, mean, strong, hard) | |
| rigid(adjective, mean, strong, hard, tough) | |
| adamant(adjective, mean, strong, hard, strength) | |
| stubborn(adjective, characteristic, quality, mean, strong) | |
| obdurate(adjective, strong, hard, tough) | |
| inflexible(adjective, mean, strong, hard, tough) | |
| hard(noun, adjective, characteristic, mean, strong) | |
| relentless(adjective, mean, strong, hard, tough) | |
| adamantine(adjective, set, strong, hard, tough) | |
| grim(adjective, tough, resist, determined) | |
| determined(adjective, strong, hard, tough) | |
| strong(adjective, hard, tough, determined) | |
| tenacious(adjective, strong, tough, solid) | |
| steadfast(adjective, strong, tough, determined) | |
| obstinate(adjective, set, mean, strong, hard) | |
| set(verb, adjective, strong, tough) | |
| stiff(adjective, resolute, rigid, inflexible) | |
| dense(adjective, set, strong, hard, tough) | |
| fast(adjective, strong, tough, solid) | |
| indurate(adjective, set, mean, hard) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |