impenetrable

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• February 10. 2013 from wordnet.princeton.edu

  impenetrable — adjective — english

  not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests"

• March 24. 2016 from wordnet.princeton.edu

  impenetrable — adjective — english

  permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"

• March 24. 2016 from wordnet.princeton.edu

  impenetrable — adjective — english

  impossible to understand; "impenetrable jargon"