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• a  admitting of penetration or passage into or through
  a penetrable wall
  penetrable defenses
• s  capable of being penetrated
  penetrable defenses

• Some 96 million Americans fuss, cuss and struggle with sheaves of tax forms covered by a barely penetrable typographic thicket.
• Most of the fun comes from seeing people fooled by what seems to us, who are in on the joke, a completely penetrable ruse.
• Uganda's Impenetrable Forest proved all too penetrable.

• impenetrable

News & Articles

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• BitTorrent Sync gaining major traction as peer-to-peer alternative to Dropbox
  If you care about data privacy and don't particularly want your shared files to sit on penetrable server, BitTorrent Sync fills the bill.
  Dec. 5, 2013 - InfoWorld

Quotes

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• Joan Didion in Oberlin Review
  This is, first and foremost, a personal project: Didion writes in the opening chapter, "This is a case in which I need whatever it is I think of to be penetrable, if only for myself."