impenetrability

1. The quality of being impenetrable (by people or light or missiles etc.) (synset 104949693)
   is a type of: quality - an essential and distinguishing attribute of something or someone
   same as: imperviousness
2. Incomprehensibility by virtue of being too dense to understand (synset 104830101)
   is a type of: incomprehensibility - the quality of being incomprehensible
   same as: impenetrableness

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