79 entries under hard topic. ×
| impliable(adjective, firm, solid, stiff) | |
| indurate(adjective, firm, solid, tense) | |
| inelastic(adjective, tough, firm, solid) | |
| jelled(adjective, tough, firm, solid) | |
| mechanical(adjective, firm, solid, tense) | |
| numbed(adjective, firm, solid, tense) | |
| ossified(adjective, firm, solid, tense) | |
| petrified(adjective, firm, solid, tense) | |
| pugnacious(adjective, severe, rough, harsh) | |
| rheumatic(adjective, firm, solid, tense) | |
| ruffianly(adjective, severe, rough, harsh) | |
| solid(adjective, tough, firm, tense) | |
| solidified(adjective, tough, firm, solid) | |
| starched(adjective, firm, solid, stiff) | |
| starchy(adjective, firm, solid, tense) | |
| stark(adjective, firm, solid, tense) | |
| steely(adjective, firm, solid, tense) | |
| taut(adjective, rough, firm, harsh) | |
| tense(adjective, firm, solid, stiff) | |
| thick(adjective, set, tough, firm) |
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| APA | Smart Define. (2015). refractory thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, refractory thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>. |
| MLA | Smart Define. "refractory thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms> |