- Definitions|2
- Thesaurus|716
- Abbreviations|0
63 entries under protected topic. ×
| strong(adjective, sound, reasonable, strain, rational) | |
| firm(adjective, strain, true, firmness, constant) | |
| sound(adjective, reasonable, strain, firm, true) | |
| stable(adjective, strain, firm, true, firmness) | |
| fast(adjective, strain, firm, firmness, constant) | |
| tight(adjective, strain, firm, true, firmness) | |
| immune(adjective, strain, firmness, safe, labour) | |
| steady(adjective, strain, firmness, safe, labour) | |
| secure(adjective, sound, reasonable, firm, true) | |
| unassailable(adjective, strong, secure, resolute, safe) | |
| invulnerable(adjective, strong, secure, resolute, safe) | |
| inviolable(adjective, secure, safe, snug, intact) | |
| safe(adjective, secure, harm, unquestionable, snug) | |
| solid(adjective, safe, unyielding, sheltered) | |
| fortified(adjective, firm, true, fixed, constant) | |
| impervious(adjective, secure, safe, snug, intact) | |
| defended(adjective, secure, safe, snug, intact) | |
| guarded(adjective, secure, safe, snug, intact) | |
| immovable(adjective, firm, true, fixed, resolute) | |
| safeguarded(adjective, secure, safe, snug, intact) |
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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> |