Dictionary

impregnable

adjective im·preg·na·ble \im-ˈpreg-nə-bəl\

: not able to be captured by attack : very strong

: not likely to be weakened or changed

Full Definition of IMPREGNABLE

1
:  incapable of being taken by assault :  unconquerable <an impregnable fortress>
2
:  unassailable; also :  impenetrable <impregnable walls>
im·preg·na·bil·i·ty \(ˌ)im-ˌpreg-nə-ˈbi-lə-tē\ noun
im·preg·na·ble·ness \im-ˈpreg-nə-bəl-nəs\ noun
im·preg·na·bly \-blē\ adverb

Examples of IMPREGNABLE

  1. <an impregnable fortress that had foiled one invader after another over the centuries>
  2. <the castle's supposedly impregnable walls>

Origin of IMPREGNABLE

Middle English imprenable, from Middle French, from in- + prenable vulnerable to capture, from prendre to take — more at prize
First Known Use: 15th century

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