85 entries under hard topic. ×
| staunch(adjective, set, strong, tough) | |
| stony(adjective, set, strong, firm) | |
| stringent(adjective, set, stiff, rigid) | |
| thick-skinned(adjective, mean, tough, harsh) | |
| tough nut to crack(expression, adjective, idiom, mean) | |
| unadaptable(adjective, set, stiff, rigid) | |
| uncompassionate(adjective, mean, tough, harsh) | |
| unimpressible(adjective, mean, tough, harsh) | |
| unshakable(adjective, mean, strong, tough) | |
| unswayable(adjective, set, stiff, rigid) | |
| unsympathetic(adjective, mean, tough, harsh) | |
| compacted(adjective, set, strong, firm) | |
| compressed(adjective, set, strong, firm) | |
| concentrated(adjective, set, strong, firm) | |
| consolidated(adjective, set, strong, firm) | |
| dyed-in-the-wool(resolute, rigid, inflexible, strict) | |
| hard-bitten | |
| hard-handed(adjective, set, strong, compact) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| hardened(adjective, set, strong, firm) |
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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> |