| 单词 | impregnability | 
| 释义 | impregnableadjective  im·preg·na·ble  im-ˈpreg-nə-bəl  1   : incapable of being taken by assault : unconquerable  an impregnable fortress 2   : unassailable    also : impenetrable   impregnable walls   impregnability   (ˌ)im-ˌpreg-nə-ˈbi-lə-tē noun  impregnableness   im-ˈpreg-nə-bəl-nəs noun  impregnably   im-ˈpreg-nə-blē adverb impregnability nounas in invulnerability Synonyms & Similar Words Relevance 
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