76 entries under hard topic. ×
| hunk(adjective, strong, substantial, compact) | |
| indurate(adjective, set, strong, firm) | |
| indurated(adjective, set, strong, firm) | |
| iron(adjective, set, strong, firm) | |
| material(adjective, strong, substantial, compact) | |
| physical(adjective, strong, substantial, compact) | |
| refractory(tough, solid, rigid, inflexible) | |
| rock(adjective, strong, substantial, compact) | |
| rock-hard(adjective, compact, dense) | |
| rock-solid(adjective, compact, dense, rock-hard) | |
| rocky(adjective, set, strong, firm) | |
| rooted(adjective, strong, substantial, compact) | |
| secure(adjective, strong, substantial, compact) | |
| stable(adjective, strong, substantial, compact) | |
| stony(adjective, set, strong, firm) | |
| unshakable(adjective, strong, substantial, compact) |
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| APA | Smart Define. (2015). concentrated thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/concentrated/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "concentrated thesaurus" https://smartdefine.org/concentrated/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, concentrated thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/concentrated/thesaurus/synonyms>. |
| MLA | Smart Define. "concentrated thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/concentrated/thesaurus/synonyms> |