95 entries under firm topic. ×
| pertinacious(adjective, tough, difficult, determined) | |
| willful(adjective, tough, fast, awkward) | |
| pigheaded(adjective, tough, difficult, determined) | |
| uncompliant(adjective, tough, stubborn, disobedience) | |
| dogged(adjective, tough, determined, unreasonable) | |
| immovable(adjective, tough, difficult, determined) | |
| incompliant(adjective, hard, tough, difficult) | |
| resolute(adjective, tough, difficult, obstinate) | |
| tough(adjective, hard, rough, grim) | |
| uncompromising(adjective, tough, difficult, violent) | |
| balky(tough, negative, hostile, obstinate) | |
| cantankerous(adjective, tough, difficult, wild) | |
| intransigent(adjective, tough, determined, stubborn) | |
| unbending(adjective, hard, tough, rough) | |
| bullheaded(adjective, tough, difficult, determined) | |
| inexorable(adjective, tough, persistent, obstinate) | |
| opinionated(adjective, tough, unreasonable, grim) | |
| stiff-necked(adjective, tough, deliberate, determined) | |
| untoward(adjective, adverb, control, order, tough) | |
| fixed(adjective, hard, tough, rough) |
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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> |