62 entries under strong topic. ×
| hard as nails(expression, adjective, idiom, hard) | |
| hardheaded(adjective, hard, tough, sturdy) | |
| heavy(adjective, hard, tough, sturdy) | |
| implacable(adjective, hard, tough, sturdy) | |
| indomitable(adjective, hard, tough, sturdy) | |
| inexorable(adjective, hard, tough, sturdy) | |
| insensible(adjective, hard, tough, sturdy) | |
| mortified(adjective, hard, tough, sturdy) | |
| mulish(adjective, hard, tough, sturdy) | |
| obdurate(adjective, hard, tough, sturdy) | |
| relentless(adjective, hard, tough, sturdy) | |
| robust(adjective, hard, tough, sturdy) | |
| rock hard(expression, adjective, hard, tough) | |
| rough(verb, adjective, hard, tough) | |
| rugged(adjective, hard, tough, sturdy) | |
| serious(adjective, hard, tough, sturdy) | |
| stiff-necked(adjective, hard, tough, sturdy) | |
| thick(adjective, hard, tough, sturdy) | |
| tough(adjective, hard, sturdy, rugged) | |
| tough inflexible(expression, hard, tough, sturdy) |
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| APA | Smart Define. (2016). steel thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/steel/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "steel thesaurus" https://smartdefine.org/steel/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, steel thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/steel/thesaurus/synonyms>. |
| MLA | Smart Define. "steel thesaurus" 24 January 2016. Web. 30 September 2026. <https://smartdefine.org/steel/thesaurus/synonyms> |