- Definitions|1
- Thesaurus|1.6k
- Abbreviations|0
| bulletheaded | |
| bullish | |
| by the book(expression, adjective, idiom, strong, hard) | |
| canny | |
| cantankerous(tough, firm, unreasonable, grim, inflexible) | |
| case-hardened | |
| clear-eyed | |
| clear-sighted | |
| commonsense(adjective, hard, sound, reasonable, sensible) | |
| contumacious(tough, firm, unreasonable, grim, inflexible) | |
| cool | |
| cruel(adjective, strong, hard, tough, severe) | |
| cussed(tough, firm, unreasonable, grim, inflexible) | |
| deep | |
| disciplinary(adjective, strong, hard, tough, severe) | |
| dogmatic | |
| dyed-in-the-wool(adjective, strong, hard, tough, severe) | |
| fanatic | |
| fanatical | |
| flinty(adjective, strong, hard, tough, severe) |
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| APA | Smart Define. (2015). hardheaded thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/hardheaded/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hardheaded thesaurus" https://smartdefine.org/hardheaded/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, hardheaded thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/hardheaded/thesaurus/synonyms>. |
| MLA | Smart Define. "hardheaded thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/hardheaded/thesaurus/synonyms> |