124 entries under hard topic. ×
| conclusive(adjective, clear, sound, complete) | |
| sound(adjective, clear, strong, secure) | |
| stony(adjective, firm, solid, stiff) | |
| strict(adjective, strong, severe, stiff) | |
| concrete(adjective, set, strong, solid) | |
| congealed(verb, adjective, set, firm) | |
| dyed-in-the-wool(adjective, set, rigid, strict) | |
| pigheaded(adjective, mean, tough, firm) | |
| refractory(adjective, tough, rough, firm) | |
| rigorous(adjective, severe, stiff, rigid) | |
| steely(adjective, firm, solid, rigid) | |
| sturdy(adjective, close, strong, sound) | |
| thick(adjective, strong, firm, solid) | |
| unadaptable(adjective, set, stiff, rigid) | |
| contracted(verb, adjective, slight, fine) | |
| hardened(adjective, set, complete, firm) | |
| harsh(adjective, mean, severe, rough) | |
| implacable(adjective, mean, tough, firm) | |
| incompliant(adjective, firm, solid, stiff) | |
| ironclad(adjective, set, firm, determined) |
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| APA | Smart Define. (2016). fixed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, fixed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>. |
| MLA | Smart Define. "fixed thesaurus" 16 March 2016. Web. 22 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms> |