IMPENETRABLE

• (adj.) not admitting of penetration or passage into or through

  "an impenetrable fortress", "impenetrable rain forests"

• (adj.) impossible to understand

  "impenetrable jargon"

• (adj.) permitting little if any light to pass through because of denseness of matter

  "dense smoke", "heavy fog", "impenetrable gloom"

  synonyms : dense , heavy

WordNet® 3.0, © 2006 by Princeton University.

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