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Definitions of impenetrable:
  • adjective:   not admitting of penetration or passage into or through
    Example: "An impenetrable fortress"
  • adjective:   impossible to understand
    Example: "Impenetrable jargon"
  • adjective:   permitting little if any light to pass through because of denseness of matter
    Example: "Impenetrable gloom"

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Search for impenetrable at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

Book See impenetrable used in context: 3 rhymes, 1 Shakespeare work, several books and articles.


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