95 entries under firm topic. ×
| starchy(adjective, hard, solid, tense) | |
| stark(adjective, hard, solid, tense) | |
| steely(adjective, hard, solid, tense) | |
| stiff as a board(expression, adjective, idiom, solid) | |
| taut(adjective, hard, rough, harsh) | |
| tense(adjective, hard, solid, stiff) | |
| thick(adjective, set, hard, tough) | |
| thickened(adjective, hard, solid, tense) | |
| unbendable(adjective, tough, unreasonable, grim) | |
| unflexible(adjective, hard, solid, tense) | |
| ungraceful(adjective, hard, solid, tense) | |
| unreasonable(tough, grim, inflexible, obstinate) | |
| unsupple(adjective, hard, solid, tense) | |
| wooden(adjective, hard, solid, tense) | |
| incompressible |
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| APA | Smart Define. (2015). refractory thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, refractory thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>. |
| MLA | Smart Define. "refractory thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms> |