Definition of impregnable adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ɪmˈpreɡnəbl//
    ; NAmE NAmE//ɪmˈpreɡnəbl//
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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
  3. Word Originlate Middle English: from Old French imprenable, from in- ‘not’ + prendre ‘take’ (from Latin prehendere). The current spelling arose in the 16th cent., perhaps influenced by Old French variants.
See the Oxford Advanced American Dictionary entry: impregnable