84 entries under adjective topic. ×
| obdurate(strong, hard, tough, sturdy) | |
| obstinate | |
| pitiless | |
| relentless(strong, hard, tough, sturdy) | |
| resolute | |
| robust(strong, hard, tough, sturdy) | |
| rock hard(expression, strong, hard, tough) | |
| rough(verb, strong, hard, tough) | |
| rugged(strong, hard, tough, sturdy) | |
| ruthless | |
| serious(strong, hard, tough, sturdy) | |
| solid | |
| stable | |
| staid | |
| stainless | |
| steadfast | |
| stern | |
| stiff-necked(strong, hard, tough, sturdy) | |
| stringent | |
| substantial |
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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> |