- Definitions|2
- Thesaurus|716
- Abbreviations|0
| unsurmountable | |
| unthreatened(adjective, secure, safe, snug, intact) | |
| untroubled | |
| vindicated(adjective, secure, safe, snug, intact) | |
| warm | |
| watched(adjective, secure, safe, snug, intact) | |
| watertight | |
| accentuated | |
| acceptable(sound, reasonable, rational) | |
| adamant | |
| adherent(firm, true, fixed, constant, steadfast) | |
| adjusted(adjective, safe, sheltered, protected, locked) | |
| agency | |
| all powerful(expression, idiom, strength) | |
| all sufficient(expression, idiom, strength) | |
| anchored(adjective, safe, sheltered, protected, locked) | |
| ardent(firm, true, fixed, constant, steadfast) | |
| arguable(sound, reasonable, rational) | |
| attached(firm, true, fixed, constant, steadfast) | |
| austerity |
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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> |