impenetrable

Adjective
  1. Not admitting of penetration or passage into or through (synset 301776177)
    "an impenetrable fortress"; "impenetrable rain forests"
    similar to: dense, thick - hard to pass through because of dense growth
  2. Permitting little if any light to pass through because of denseness of matter (synset 302425186)
    "dense smoke"; "heavy fog"; "impenetrable gloom"
    similar to: thick - relatively dense in consistency
    same as: dense, heavy
  3. Impossible to understand (synset 300537141)
    "impenetrable jargon"
    similar to: incomprehensible, uncomprehensible - difficult to understand

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