9 entries under unreasonable topic. ×
| headstrong(adjective, tough, firm, grim) | |
| mulish(adjective, tough, firm, determined) | |
| bullheaded(adjective, tough, firm, determined) | |
| intractable(adjective, tough, firm, determined) | |
| perverse(adjective, tough, firm, determined) | |
| pigheaded(adjective, tough, firm, grim) | |
| refractory(adjective, tough, firm, determined) | |
| self-willed(adjective, tough, firm, determined) | |
| willful(adjective, tough, firm, determined) |
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| APA | Smart Define. (2015). mule thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/mule/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mule thesaurus" https://smartdefine.org/mule/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, mule thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/mule/thesaurus/synonyms>. |
| MLA | Smart Define. "mule thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/mule/thesaurus/synonyms> |