78 entries under tough topic. ×
| flinty(adjective, strong, hard, solid) | |
| inflexible(adjective, close, set, strong, hard) | |
| obdurate(adjective, strong, hard, sturdy) | |
| solidified(adjective, set, hard, solid) | |
| steely(adjective, strong, hard, sturdy) | |
| sturdy(adjective, person, close, set, body) | |
| adamantine(adjective, set, strong, hard) | |
| congealed(adjective, set, hard, solid) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| impervious(adjective, set, hard, solid) | |
| iron(adjective, set, strong, hard) | |
| jelled(adjective, set, hard, solid) | |
| robust(adjective, person, body, strong, hard) | |
| strict(adjective, strong, hard, sturdy) | |
| adamant(adjective, strong, hard, sturdy) | |
| close-grained(adjective, set, hard, firm) | |
| hardened(adjective, set, strong, hard) | |
| insensible(adjective, strong, hard, innocent) | |
| tough inflexible(expression, strong, hard, sturdy) | |
| unbending(adjective, close, strong, hard) |
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| APA | Smart Define. (2015). dense thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/dense/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "dense thesaurus" https://smartdefine.org/dense/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, dense thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/dense/thesaurus/synonyms>. |
| MLA | Smart Define. "dense thesaurus" 17 July 2015. Web. 26 September 2026. <https://smartdefine.org/dense/thesaurus/synonyms> |