Usually means: Inability to be penetrated or conquered.
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We found 6 dictionaries that define the word impregnableness:

General (6 matching dictionaries)
  1. impregnableness: Merriam-Webster
  2. impregnableness: Collins English Dictionary
  3. impregnableness: Wordnik
  4. impregnableness: Wiktionary
  5. impregnableness: Dictionary.com
  6. impregnableness: FreeDictionary.org

(Note: See impregnable as well.)

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Definitions from Wiktionary (impregnableness)

▸ noun:  The state of being impregnable; impregnability.

Similar:
imperviousness, unimpugnability, imperviability, imperviableness, impenetrableness, impenetrability, inexpugnableness, inexpugnability, impassableness, impermeableness, more...

Opposite:
vulnerability, penetrability, permeability

▸ Words similar to impregnableness

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▸ Popular adjectives describing impregnableness

▸ Words that often appear near impregnableness

▸ Rhymes of impregnableness

▸ Invented words related to impregnableness

Similar:
imperviousness, unimpugnability, imperviability, imperviableness, impenetrableness, impenetrability, inexpugnableness, inexpugnability, impassableness, impermeableness, more...

Opposite:
vulnerability, penetrability, permeability



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