78 entries under tough topic. ×
| hardheaded(adjective, strong, hard, sturdy) | |
| harsh(adjective, strong, hard, sturdy) | |
| immovable(adjective, strong, hard, sturdy) | |
| implacable(adjective, strong, hard, sturdy) | |
| indomitable(adjective, strong, hard, sturdy) | |
| inexorable(adjective, strong, hard, sturdy) | |
| mortified(adjective, strong, hard, sturdy) | |
| mulish(adjective, strong, hard, stupid) | |
| relentless(adjective, strong, hard, sturdy) | |
| rigorous(adjective, strong, hard, sturdy) | |
| rock hard(expression, adjective, strong, hard) | |
| rough(adjective, strong, hard, wild) | |
| serious(adjective, strong, hard, big) | |
| severe(adjective, strong, hard, big) | |
| steel(adjective, strong, hard, sturdy) | |
| stiff-necked(adjective, strong, hard, stupid) | |
| unrelenting(adjective, strong, hard, sturdy) | |
| unsparing(adjective, strong, hard, sturdy) |
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| APA | Smart Define. (2015). dense thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/dense/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "dense thesaurus" https://smartdefine.org/dense/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, dense thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/dense/thesaurus/synonyms>. |
| MLA | Smart Define. "dense thesaurus" 17 July 2015. Web. 27 September 2026. <https://smartdefine.org/dense/thesaurus/synonyms> |