- Definitions|2
- Thesaurus|716
- Abbreviations|0
| staunch(adjective, strong, firm, true, fixed) | |
| steely | |
| sturdy | |
| sure(adjective, firm, true, fixed, resolute) | |
| swift | |
| tenacious(adjective, firm, true, fixed, constant) | |
| tended(adjective, secure, safe, snug, intact) | |
| unafraid | |
| unasked | |
| undamaged(adjective, secure, safe, snug, intact) | |
| undampable | |
| under lock and key(expression, idiom, secure, safe, snug) | |
| undestroyable | |
| undying | |
| unharmed(adjective, secure, safe, snug, intact) | |
| unhurt(adjective, secure, safe, snug, intact) | |
| uninjured(adjective, secure, safe, snug, intact) | |
| unmolested(adjective, secure, safe, snug, intact) | |
| unscathed(adjective, secure, safe, snug, intact) | |
| unsubduable |
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| APA | Smart Define. (2015). impregnable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, impregnable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>. |
| MLA | Smart Define. "impregnable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms> |