- Definitions|1
- Thesaurus|497
- Abbreviations|0
| destined(adjective, certain) | |
| double-checked(set, certain, evident, unquestionable, indisputable) | |
| faultless | |
| free from danger(expression, idiom, secure, safe, snug) | |
| genuine(adjective, certain) | |
| guaranteed(adjective, certain) | |
| guarded(adjective, secure, safe, snug, intact) | |
| heavy | |
| home-free(adjective, secure, safe, snug, intact) | |
| immutable | |
| impassible | |
| impervious(adjective, sound, secure, firm, safe) | |
| in safety(expression, adjective, secure, safe, snug) | |
| inalienable(adjective, absolute, inherent) | |
| incontestible | |
| infallible(adjective, certain) | |
| infrangible | |
| intact(adjective, secure, safe, snug, sheltered) | |
| inviolate | |
| irrebuttable(set, certain, unquestionable, indisputable, ironclad) |
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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> |