- Definitions|2
- Thesaurus|716
- Abbreviations|0
135 entries under adjective topic. ×
| locked(safe, sheltered, protected) | |
| nailed(safe, sheltered, protected, locked) | |
| obdurate | |
| parlous | |
| petrified | |
| protective | |
| riskless(safe, sheltered, protected, locked) | |
| rocklike | |
| rugged | |
| safe as houses(expression, idiom, safe, sheltered) | |
| solid as a rock(expression, idiom, safe, sheltered) | |
| solidified | |
| stony | |
| tempered | |
| well-fortified |
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| APA | Smart Define. (2015). impregnable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, impregnable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>. |
| MLA | Smart Define. "impregnable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms> |