85 entries under hard topic. ×
| steely(adjective, dull, strong, tough) | |
| harsh(adjective, characteristic, mean, tough) | |
| immovable(adjective, mean, strong, tough) | |
| resolute(adjective, determined, resolution, rigid) | |
| cruel(adjective, strong, tough, inflexible) | |
| obstinate(adjective, set, mean, strong) | |
| pig(noun, metal) | |
| dense(adjective, set, strong, tough) | |
| heavy(adjective, strong, tough, inflexible) | |
| indurate(adjective, set, mean, firm) | |
| stiff-necked(adjective, mean, tough, firm) | |
| strict(adjective, persistent, rigid, obstinate) | |
| tough(adjective, mean, strong, firm) | |
| uncooperative(adjective, mean, persistent, rigid) | |
| cast(noun, metal) | |
| compact(adjective, set, strong, firm) | |
| dogged(adjective, mean, strong, tough) | |
| ferric(adjective, strong, tough, inflexible) | |
| ferrous metal(noun, expression) | |
| immutable(adjective, set, stiff, rigid) |
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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> |