187 entries under hard topic. ×
| staunch(adjective, set, strong, firm) | |
| sturdy(adjective, strong, tough, solid) | |
| compressed(adjective, set, tough, firm) | |
| fatiguing(adjective, difficult, demanding, protracted) | |
| hardened(adjective, tough, firm, solid) | |
| inaccessible(adjective, unfeeling, unsympathetic, expensive) | |
| leathery(adjective, strong, solid, sturdy) | |
| merciless(adjective, rough, harsh, cruel) | |
| petrified(adjective, firm, rigid, inflexible) | |
| solidified(adjective, set, tough, firm) | |
| fibrous(adjective, strong, thin, solid) | |
| flinty(adjective, strong, severe, harsh) | |
| immutable(adjective, set, severe, rough) | |
| ironclad(adjective, set, severe, harsh) | |
| oppressive(adjective, severe, rough, difficult) | |
| rocky(adjective, set, strong, firm) | |
| spiritless(adjective, dull, careless, indifferent) | |
| close(adjective, set, tough, severe) | |
| concentrated(adjective, set, strong, tough) | |
| concrete(adjective, set, tough, solid) |
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| APA | Smart Define. (2015). stiff thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, stiff thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff thesaurus" 24 December 2015. Web. 25 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms> |