95 entries under firm topic. ×
| grim(tough, unreasonable, stubborn, problematic) | |
| hard-core(determined, impulsive, stubborn, reckless) | |
| hard-nosed(determined, impulsive, obstinate, stubborn) | |
| hardened(adjective, hard, tough, solid) | |
| hardheaded(tough, unreasonable, grim, inflexible) | |
| immalleable(adjective, hard, solid, stiff) | |
| impliable(adjective, hard, solid, stiff) | |
| indurate(adjective, hard, solid, tense) | |
| inelastic(adjective, hard, tough, solid) | |
| jelled(adjective, hard, tough, solid) | |
| mechanical(adjective, hard, solid, tense) | |
| mule(tough, determined, unreasonable, grim) | |
| numbed(adjective, hard, solid, tense) | |
| ossified(adjective, hard, solid, tense) | |
| persevering(adjective, tough, unreasonable, grim) | |
| petrified(adjective, hard, solid, tense) | |
| rheumatic(adjective, hard, solid, tense) | |
| solid(adjective, hard, tough, tense) | |
| solidified(adjective, hard, tough, solid) | |
| starched(adjective, hard, solid, stiff) |
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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> |