Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Old French
Origin: imprenable 'impossible to capture', from prendre 'to take'

impregnable

 adjective
     
im‧preg‧na‧ble formal
1 a building that is impregnable is so strong that it cannot be entered by force:
an impregnable fortress
2 strong and impossible to change or influence:
her impregnable obstinacy
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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