Examples of usage:

  1. Angelina maintained an impenetrable reserve. "The Golden Scarecrow" by Hugh Walpole
  2. Against the rock Heracles held the beast; strongly he held it, choking it through the skin that was almost impenetrable. "The Golden Fleece and the Heroes who Lived Before Achilles" by Padraic Colum
  3. He had brought four big lamps with him, and these he now lit, but there seemed to be something impenetrable about the darkness of this vast room. "Here and Hereafter" by Barry Pain
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