| 单词 | impregnable | 
| 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 impregnable adjective1 as in invincibleincapable of being defeated, overcome, or subdued an impregnable fortress that had foiled one invader after another over the centuries Synonyms & Similar Words Relevance 
 Antonyms & Near Antonyms 
 2 as in impenetrableimpossible to get through or into the castle's supposedly impregnable walls Synonyms & Similar Words 
 Antonyms & Near Antonyms 
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