- Definitions|1
- Thesaurus|474
- Abbreviations|0
| strongheaded | |
| stupid(adjective, informal, stubborn) | |
| sulky | |
| sullen | |
| tough-nut(adjective, hard, tough, difficult, wild) | |
| tough nut(expression, sharp, determined, practical, shrewd) | |
| tough nut to crack(expression, adjective, idiom, mean, hard) | |
| unappeasable(adjective, determined, resolute, uncompromising, unshakeable) | |
| unfaltering(adjective, steadfast) | |
| unflagging | |
| unflappable(adjective, set, firm, determined, usual) | |
| unforgiving(adjective, determined, resolute, uncompromising, unshakeable) | |
| unimpressible(adjective, mean, hard, harsh, inflexible) | |
| unreasonable(tough, firm, grim, inflexible, obstinate) | |
| unshakable(adjective, mean, hard, tough, firm) | |
| untoward(tough, firm, unreasonable, grim, inflexible) | |
| unwavering | |
| usual(adjective, firm, determined, regular, planned) | |
| well-set(adjective, firm, determined, usual, regular) | |
| wrongheaded |
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| APA | Smart Define. (2015). pigheaded thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/pigheaded/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "pigheaded thesaurus" https://smartdefine.org/pigheaded/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, pigheaded thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/pigheaded/thesaurus/synonyms>. |
| MLA | Smart Define. "pigheaded thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/pigheaded/thesaurus/synonyms> |