- Definitions|2
- Thesaurus|716
- Abbreviations|0
| overpowering | |
| overwhelming | |
| powerful | |
| proof against(verb, expression, phrasal verb, strength, safety) | |
| resistless | |
| safeguarded(adjective, secure, safe, snug, intact) | |
| shielded(adjective, secure, safe, snug, intact) | |
| undefeatable | |
| unkillable | |
| unshakable(adjective, steady) | |
| unstoppable | |
| untouchable | |
| accented | |
| airtight | |
| bombproof | |
| buttoned up(expression, adjective, secure, safe, snug) | |
| cherished(adjective, secure, safe, snug, intact) | |
| close(adjective, firm, true, fixed, constant) | |
| dangerous(adjective, hazardous, troubling) | |
| deathless |
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| APA | Smart Define. (2015). impregnable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, impregnable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>. |
| MLA | Smart Define. "impregnable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms> |