| unconquerable(adjective, obstinate, insistent, dogged) | |
| bound and determined(expression, adjective, idiom, determined, serious) | |
| committed(adjective, resolute, dedicated, unwavering, unfaltering) | |
| conscientious | |
| contrary(adjective, determined, fixed, obstinate, stubborn) | |
| dependable(adjective, strong, tough, certain, regular) | |
| energetic | |
| evergreen | |
| flat(adjective, strong, certain, definite, continuous) | |
| froward(adjective, deliberate, determined, obstinate, insistent) | |
| game(adjective, determined, resolute, brave, willing) | |
| hardy(tough, determined, resolute, sturdy, hard-wearing) | |
| homogeneous(adjective, regular, even, constant, uniform) | |
| intrepid | |
| invincible(adjective, obstinate, insistent, dogged) | |
| laborious | |
| level(adjective, continuous) | |
| lifelong(adjective, continuous, hardened, lasting, continuing) | |
| monolithic(adjective, continuous) | |
| nagging |
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| APA | Smart Define. (2015). persistent thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/persistent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "persistent thesaurus" https://smartdefine.org/persistent/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, persistent thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/persistent/thesaurus/synonyms>. |
| MLA | Smart Define. "persistent thesaurus" 1 June 2015. Web. 20 September 2026. <https://smartdefine.org/persistent/thesaurus/synonyms> |