- Definitions|2
- Thesaurus|716
- Abbreviations|0
| bad | |
| believable(sound, reasonable, rational) | |
| bond | |
| bound(adjective, safe, sheltered, protected, locked) | |
| brassbound | |
| bulletproof | |
| buttoned down(expression, adjective, safe, sheltered, protected) | |
| callous | |
| closely adhering(expression, idiom) | |
| compressed | |
| concrete | |
| condensed | |
| condonable(sound, reasonable, rational) | |
| consistency | |
| constitute | |
| constrained(firm, true, fixed, constant, steadfast) | |
| consume | |
| continuance | |
| credible(sound, reasonable, rational) | |
| dense |
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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> |