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• a  not admitting of penetration or passage into or through
  an impenetrable fortress
  impenetrable rain forests
• s  permitting little if any light to pass through because of denseness of matter
  impenetrable gloom
• s  impossible to understand
  impenetrable jargon

• Case in point: the vast, impenetrable western reaches of the Amazon.
• Many Pakistanis, however, consider him simply a convenient scapegoat, and in any case, ascribing the attacks to an elusive militant leader hidden in the impenetrable mountains of .
• For one, the group the Administration named Sunday as providing weapons to the insurgents the Islamic Revolutionary Guard Corps's Quds force is virtually impenetrable.

• dense
• heavy

• penetrable

News & Articles

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• The Dark and Dreamy Rock of Sigur Rós
  Sometimes even the alien can become familiar. When it comes to the musical mainstream, Sigur Rós – a post-rock group from Iceland, known for their impenetrable lyrics and atmospheric, celestial sound – is pretty out there. But over the past few years, their music has been slowly worming its way into our ears, heard in the films of Wes Anderson and on television shows like CSI. More recently, the ...
  June 18, 2013 - Time Magazine
• Much ado about Shakespeare: A brief, hipper Bard in Taunton
  For those who find Shakespeare’s works impenetrable — and for those who adore his every word — this modern, fast-paced comedy show is made for them.
  June 17, 2013 - The Taunton Gazette
• Marc Jacobs Called Cara Delevingne a Dwarf
  Cara Delevingne, model of many faces, catapulted into stardom during September's fashion weeks — even reaching a seemingly impenetrable point where she was comfortable enough to tell glossies that she was getting a bit tired of modeling. She was crowned London's top model for her catwalk appearances at their fall fashion ... More »
  June 17, 2013 - New York Magazine

Quotes

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• Cate Blanchett in Washington Post
  Haynes "wanted to talk to me before I read the script, which was actually really wise, because the script was verging on impenetrable," Blanchett said. "Because it was a filmmaker script, all the pieces of the puzzle were in Todd's mind. I...
• Kevin McKidd in Sacramento Bee
  My indigenous accent,McKidd said -- in his proper British style -- "is completely impenetrable. Even I don't understand it."
• JJ Abrams in San Jose Mercury News
  I watched a few minutes, and I was so confused,said Abrams, who also created the ABC series. "It was impenetrable. I was like, 'I know I should understand this. But who the (expletive) is that guy?' "