Usually means: Impossible to break through, impervious.
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We found 10 dictionaries that define the word unpenetrable:

General (10 matching dictionaries)
  1. unpenetrable: Merriam-Webster
  2. unpenetrable: Wordnik
  3. unpenetrable: Wiktionary
  4. Unpenetrable: Dictionary.com
  5. Unpenetrable: Online Plain Text English Dictionary
  6. unpenetrable: Webster's Revised Unabridged, 1913 Edition
  7. Unpenetrable: AllWords.com Multi-Lingual Dictionary
  8. unpenetrable: Webster's 1828 Dictionary
  9. unpenetrable: FreeDictionary.org
  10. Unpenetrable: TheFreeDictionary.com

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Definitions from Wiktionary (unpenetrable)

▸ adjective:  impenetrable

Similar:
impenetrable, unimpenetrable, nonpenetrable, inpenetrable, unbreachable, unpermeable, impierceable, impermeable, imperviable, impervious, more...

Types:
impenetrable, impermeable, insurmountable, invulnerable, unassailable, unbreakable, unbeatable, more...

▸ Words similar to unpenetrable

▸ Usage examples for unpenetrable

▸ Idioms related to unpenetrable

▸ Wikipedia articles (New!)

▸ Popular nouns described by unpenetrable

▸ Words that often appear near unpenetrable

▸ Rhymes of unpenetrable

▸ Invented words related to unpenetrable

Similar:
impenetrable, unimpenetrable, nonpenetrable, inpenetrable, unbreachable, unpermeable, impierceable, impermeable, imperviable, impervious, more...

Types:
impenetrable, impermeable, insurmountable, invulnerable, unassailable, unbreakable, unbeatable, more...



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