- Definitions|2
- Thesaurus|652
- Abbreviations|0
69 entries under firm topic. ×
| refractory(adjective, tough, difficult, determined) | |
| stiff-necked(adjective, tough, resist, determined) | |
| unwavering(adjective, strong, determined, steady) | |
| tireless(adjective, strong, energetic, determined) | |
| unfaltering(adjective, strong, energetic, determined) | |
| unshakable(adjective, tough, determined, resolute) | |
| fixed(adjective, tough, determined, resolute) | |
| self-willed(adjective, tough, difficult, determined) | |
| unflagging(adjective, strong, energetic, determined) | |
| unswerving(adjective, strong, tough, determined) | |
| staunch(adjective, strong, tough, determined) | |
| unfailing(adjective, strong, determined, steady) | |
| constant(adjective, strong, determined, active) | |
| indomitable(adjective, strong, tough, difficult) | |
| patient(adjective, strong, energetic, determined) | |
| single-minded(adjective, tough, determined, resolute) | |
| tough(adjective, determined, resolute, obstinate) | |
| plodding(adjective, strong, determined, steady) | |
| recalcitrant(adjective, tough, difficult, awkward) | |
| steady(adjective, strong, determined, resolute) |
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| APA | Smart Define. (2015). pertinacious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/pertinacious/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "pertinacious thesaurus" https://smartdefine.org/pertinacious/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, pertinacious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/pertinacious/thesaurus/synonyms>. |
| MLA | Smart Define. "pertinacious thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/pertinacious/thesaurus/synonyms> |