- Definitions|0
- Thesaurus|72
- Abbreviations|0
| indefatigable | |
| indocile(obstinate, stubborn, willful) | |
| indomitable(obstinate, stubborn, willful) | |
| inexorable | |
| insistent | |
| insoluble(obstinate, stubborn, willful) | |
| level-headed(adjective, tough, sharp, sensible, sober) | |
| locked(obstinate, stubborn, willful, intransigent) | |
| pat(obstinate, stubborn, willful) | |
| persevering | |
| persistent | |
| perverse(sharp, practical, shrewd, obstinate, stubborn) | |
| pig-headed(obstinate, stubborn, willful, intransigent) | |
| recalcitrant(obstinate, stubborn, willful) | |
| refractory(obstinate, stubborn, willful) | |
| relentless | |
| rigid | |
| self-willed(obstinate, stubborn, willful) | |
| single-minded | |
| staunch |
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| APA | Smart Define. (2011). tough nut thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/tough_nut/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "tough nut thesaurus" https://smartdefine.org/tough_nut/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2011, tough nut thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/tough_nut/thesaurus/synonyms>. |
| MLA | Smart Define. "tough nut thesaurus" 23 May 2011. Web. 27 September 2026. <https://smartdefine.org/tough_nut/thesaurus/synonyms> |