- Definitions|2
- Thesaurus|572
- Abbreviations|0
| iron(adjective, persistent, obstinate, insistent, dogged) | |
| ironclad(set, certain, unquestionable, indisputable, unassailable) | |
| irrebuttable(set, certain, unquestionable, indisputable, unassailable) | |
| irrefutable | |
| lasting | |
| loyal | |
| mighty | |
| mutinous(adjective, persistent, obstinate, insistent, dogged) | |
| narrow-minded(adjective, persistent, obstinate, insistent, dogged) | |
| never-tiring | |
| nonperishable | |
| nulli secundus | |
| obsessive(adjective, persistent, obstinate, insistent, dogged) | |
| obvious(set, certain, unquestionable, indisputable, unassailable) | |
| patient | |
| permanent | |
| perseverant | |
| persevering | |
| persisting | |
| plodding |
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| APA | Smart Define. (2015). invincible thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/invincible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "invincible thesaurus" https://smartdefine.org/invincible/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, invincible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/invincible/thesaurus/synonyms>. |
| MLA | Smart Define. "invincible thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/invincible/thesaurus/synonyms> |