95 entries under firm topic. ×
| stiff(adjective, hard, tough, strain, rough) | |
| stubborn(adjective, characteristic, quality, obstinate, stubbornness) | |
| hard(adjective, tough, strain, rough) | |
| unyielding(adjective, hard, tough, strain, rough) | |
| intractable(adjective, control, order, tough, difficulty) | |
| rigid(adjective, hard, tough, strain) | |
| contumacious(adjective, tough, determined, negative) | |
| resistant(adjective, strain, solid, firmness) | |
| headstrong(adjective, tough, determined, negative) | |
| rebellious(adjective, tough, negative, obstinate) | |
| tight(adjective, strain, solid, firmness) | |
| perverse(adjective, mean, tough, difficulty) | |
| insubordinate(adjective, tough, negative, hostile) | |
| self-willed(adjective, tough, difficult, wild) | |
| inflexible(adjective, hard, tough, rough) | |
| mulish(adjective, tough, difficult, determined) | |
| obdurate(adjective, tough, difficult, determined) | |
| tenacious(adjective, tough, difficult, wild) | |
| adamant(adjective, tough, determined, unreasonable) | |
| determined(adjective, tough, persistent, impulsive) |
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| APA | Smart Define. (2015). refractory thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, refractory thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>. |
| MLA | Smart Define. "refractory thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms> |