69 entries under hard topic. ×
| rigorous(adjective, strong, complete, tough) | |
| rock hard(expression, adjective, strong, tough) | |
| serious(adjective, strong, tough, sturdy) | |
| steel(adjective, strong, tough, sturdy) | |
| stiff-necked(adjective, strong, tough, sturdy) | |
| strict(adjective, strong, tough, sturdy) | |
| tough inflexible(expression, strong, tough, sturdy) | |
| unbending(adjective, strong, tough, sturdy) | |
| unsparing(adjective, strong, tough, sturdy) |
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| APA | Smart Define. (2016). robust thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/robust/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "robust thesaurus" https://smartdefine.org/robust/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, robust thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/robust/thesaurus/synonyms>. |
| MLA | Smart Define. "robust thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/robust/thesaurus/synonyms> |