- Definitions|1
- Thesaurus|497
- Abbreviations|0
| imperdible | |
| impossible to attack(expression, idiom) | |
| in safe hands(expression, adjective, idiom, snug, intact) | |
| in the bag(adjective, certain) | |
| indefeasible | |
| indestructible | |
| indisputably | |
| indivisibles | |
| infusible | |
| inseparables | |
| insurmountable | |
| intense | |
| iron(adjective, safe, sheltered, protected, locked) | |
| leakproof | |
| locked(adjective, sound, firm, safe, sheltered) | |
| nailed(adjective, sound, firm, safe, sheltered) | |
| nonnegotiable | |
| not shakable(expression, idiom) | |
| obstinate | |
| on ice(adjective, certain) |
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| APA | Smart Define. (2015). unassailable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unassailable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unassailable thesaurus" https://smartdefine.org/unassailable/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, unassailable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unassailable/thesaurus/synonyms>. |
| MLA | Smart Define. "unassailable thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unassailable/thesaurus/synonyms> |