128 entries under hard topic. ×
| indomitable(adjective, strong, tough, sturdy) | |
| indurate(adjective, set, strong, firm) | |
| indurated(adjective, set, strong, firm) | |
| inexorable(adjective, strong, tough, sturdy) | |
| lusty(adjective, strong, solid, stiff) | |
| molded(adjective, strong, solid, stiff) | |
| mortified(adjective, strong, tough, sturdy) | |
| mulish(adjective, strong, tough, stupid) | |
| refractory(solid, rigid) | |
| relentless(adjective, strong, tough, sturdy) | |
| resilient(adjective, strong, solid, stiff) | |
| rigorous(adjective, strong, tough, sturdy) | |
| rock(adjective, strong, substantial, compact) | |
| rock-hard(adjective, compact) | |
| rock-solid(adjective, compact, rock-hard) | |
| rock hard(expression, adjective, strong, tough) | |
| rooted(adjective, strong, substantial, compact) | |
| rough(adjective, strong, tough, wild) | |
| seasoned(adjective, strong, solid, stiff) | |
| serious(adjective, strong, tough, big) |
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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> |