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impenetrable
 
Adjective impenetrable has 3 senses
  1. impenetrable - not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests"
    Antonym:     penetrable
  2. dense, heavy, impenetrable - permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"
    Antonym: thin (indirect, via thick)
  3. impenetrable - impossible to understand; "impenetrable jargon"
    Antonyms:     comprehensible, comprehendible (indirect, via incomprehensible)
impended impendence impendency impendind impending impending impenetrability impenetrable impenetrable impenetrableness impenetrably impenetrated impenitence impenitency impenitent impenitently impenitrable

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