95 entries under firm topic. ×
| relentless(tough, persistent, obstinate, stubborn) | |
| set(adjective, hard, tough, solid) | |
| single-minded(adjective, tough, persistent, obstinate) | |
| stony(adjective, hard, solid, stiff) | |
| cussed(tough, persistent, obstinate, stubborn) | |
| ornery(tough, cross, negative, hostile) | |
| unshakable(adjective, tough, unreasonable, grim) | |
| annealed(adjective, hard, solid, tense) | |
| arthritic(adjective, hard, solid, tense) | |
| benumbed(adjective, hard, solid, tense) | |
| brittle(adjective, hard, solid, tense) | |
| buckram(adjective, hard, solid, tense) | |
| cemented(adjective, hard, solid, tense) | |
| chilled(adjective, hard, solid, tense) | |
| congealed(adjective, hard, tough, solid) | |
| contracted(adjective, hard, solid, tense) | |
| creaky(adjective, hard, solid, tense) | |
| dead set on(expression, determined, fixed, stubborn) | |
| frozen(adjective, hard, solid, tense) | |
| graceless(adjective, hard, solid, tense) |
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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> |