- Definitions|2
- Thesaurus|572
- Abbreviations|0
| immutable | |
| impassible(adjective, invulnerable) | |
| imperishable | |
| impervious(adjective, invulnerable) | |
| inalterable | |
| inarguable(set, certain, unquestionable, indisputable, unassailable) | |
| incomparable | |
| incorruptible | |
| indelible | |
| indubitable(set, certain, unquestionable, indisputable, unassailable) | |
| industrious | |
| ineffaceable | |
| ineradicable | |
| inimitable | |
| insistent | |
| insubordinate(adjective, persistent, obstinate, insistent, dogged) | |
| insurgent(adjective, persistent, obstinate, insistent, dogged) | |
| intractable(adjective, persistent, obstinate, insistent, dogged) | |
| inveterate(adjective, persistent, obstinate, insistent, dogged) | |
| invincibly |
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| APA | Smart Define. (2015). invincible thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/invincible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "invincible thesaurus" https://smartdefine.org/invincible/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, invincible thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/invincible/thesaurus/synonyms>. |
| MLA | Smart Define. "invincible thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/invincible/thesaurus/synonyms> |