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Definition of impregnable adjective from the Oxford Advanced American Dictionary

     

    impregnable

     adjective
    adjective
    NAmE//ɪmˈprɛɡnəbl//
     
     
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  1. 1an impregnable building is so strongly built that it cannot be entered by force an impregnable fortress
  2. 2strong and impossible to defeat or change synonym invincible The team built up an impregnable 5–1 lead. the seemingly impregnable Nazi regime
See impregnable in the Oxford Advanced Learner's Dictionary
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