128 entries under hard topic. ×
| insensible(adjective, strong, tough, innocent) | |
| leathery(adjective, strong, solid, stiff) | |
| material(adjective, strong, big, heavy) | |
| tough as nails(expression, adjective, idiom, strong) | |
| tough inflexible(expression, strong, tough, sturdy) | |
| unbending(adjective, close, strong, tough) | |
| unbreakable(adjective, strong, firm, solid) | |
| astringent(adjective, strong, tough, sturdy) | |
| austere(adjective, strong, tough, sturdy) | |
| authoritarian(adjective, strong, tough, sturdy) | |
| bitter(adjective, strong, tough, sturdy) | |
| brick wall(expression, adjective, strong, substantial) | |
| bullheaded(adjective, strong, tough, stupid) | |
| by the book(expression, adjective, idiom, strong) | |
| conditioned(adjective, strong, solid, stiff) | |
| determined(adjective, strong, tough) | |
| dimensional(adjective, strong, substantial, compact) | |
| disciplinary(adjective, strong, tough, sturdy) | |
| dyed-in-the-wool(adjective, strong, tough, sturdy) | |
| ferric(adjective, strong, tough, sturdy) |
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| APA | Smart Define. (2015). dense thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/dense/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "dense thesaurus" https://smartdefine.org/dense/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, dense thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/dense/thesaurus/synonyms>. |
| MLA | Smart Define. "dense thesaurus" 17 July 2015. Web. 24 September 2026. <https://smartdefine.org/dense/thesaurus/synonyms> |