- Definitions|0
- Thesaurus|72
- Abbreviations|0
| dogged(adjective, determined, persistent) | |
| adamant | |
| bull-headed(obstinate, stubborn, willful, intransigent) | |
| bullheaded | |
| firm | |
| hang tough(expression, adjective, tough, sharp, sensible) | |
| hanging tough | |
| hard-line(obstinate, stubborn, willful) | |
| hard-nosed | |
| hardheaded | |
| immovable(adjective, steady, fixed, obstinate, stubborn) | |
| inflexible(determined, steady, fixed, impassive, obstinate) | |
| intractable(adjective, sharp, difficult, practical, shrewd) | |
| intransigent(steady, fixed, impassive, inflexible, obstinate) | |
| locked in(expression, sharp, fixed, impassive, inflexible) | |
| mulish(sharp, determined, practical, shrewd, obstinate) | |
| obdurate(determined, steady, fixed, impassive, inflexible) | |
| obstinate(sharp, determined, practical, shrewd, stubborn) | |
| perseverant | |
| perseverative |
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| APA | Smart Define. (2011). tough nut thesaurus. Retrieved September 21, 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 21, 2026). |
| Harvard | Smart Define 2011, tough nut thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/tough_nut/thesaurus/synonyms>. |
| MLA | Smart Define. "tough nut thesaurus" 23 May 2011. Web. 21 September 2026. <https://smartdefine.org/tough_nut/thesaurus/synonyms> |