113 entries under hard topic. ×
| jelled(adjective, set, tough, firm) | |
| resistant(adjective, strong, tough, fit) | |
| stony(adjective, firm, stiff, rigid) | |
| unbending(adjective, firm, stiff, tense) | |
| unbreakable(adjective, strong, tough, severe) | |
| adamantine(adjective, set, strong, severe) | |
| broad(adjective, strong, big, heavy) | |
| callous(adjective, set, strong, firm) | |
| chunky(adjective, big, heavy, deep) | |
| congealed(adjective, set, tough, firm) | |
| frozen(adjective, firm, stiff, tense) | |
| impermeable(adjective, close, set, tough) | |
| nonporous(rigid, resistant, impervious, density) | |
| rooted(adjective, strong, secure, steady) | |
| steely(adjective, firm, stiff, tense) | |
| fat(adjective, heavy, deep, round) | |
| hardened(adjective, set, strong, tough) | |
| inelastic(adjective, tough, severe, firm) | |
| rock(adjective, compact, dense, rock-hard) | |
| brick wall(expression, adjective, calm, strong) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |