260 entries under adjective topic. ×
| determined(strong, hard, tough, firm) | |
| strong(hard, tough, firm, determined) | |
| indomitable(characteristic, strong, hard, tough) | |
| robust(strong, hard, tough, inflexible) | |
| uncompliant(tough, resist, unreasonable, grim) | |
| ferrous(strong, hard, tough, inflexible) | |
| incompliant(resist, determined, resolute, persistent) | |
| steely(dull, strong, hard, tough) | |
| sturdy | |
| tenacious(strong, tough, firm, solid) | |
| brassbound(resist, determined, resolute, persistent) | |
| cast-iron | |
| die-hard(resist, determined, resolute, persistent) | |
| harsh(characteristic, mean, hard, tough) | |
| immovable(mean, strong, hard, tough) | |
| remorseless(resist, determined, resolute, persistent) | |
| resolute(hard, determined, resolution, rigid) | |
| steadfast(strong, tough, firm, determined) | |
| unbendable(resist, determined, resolute, persistent) | |
| able-bodied |
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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> |