a dark, impenetrable forest.
poems of impenetrable obscurity.
impenetrable interviews with French intellectuals.
I find his style somewhat impenetrable.
The language of this document would be impenetrable to anyone except a specialist.
his impenetrable eyes and inscrutable countenance give little away.
his career shows just how impenetrable European assumptions were.
Despite heavy winds and nearly impenetrable ground fog, the plane landed safely.
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