not intelligible; not capable of being understood.

1610–20; un-1 + intelligible

unintelligibility, unintelligibleness, noun
unintelligibly, adverb

unintelligent, unintelligible.

incomprehensible, baffling, undecipherable.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unintelligible (ˌʌnɪnˈtɛlɪdʒɪbəl)
not able to be understood; incomprehensible

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1616, "incapable of being understood," from un- (1) "not" + intelligible.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So my guess is that these forms are unintelligible because that helps justify
  the absurd price.
As to the translation, even catching a completely unintelligible but organized
  signal would be a world shaking triumph.
Their conversation is a burbling, unintelligible stream.
The result is to scramble up the letters in the outgoing message so that it is
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