Examples of usage:

  1. He has not heard them express it in speech, for in this way they cannot communicate with one another; but certain looks and gestures exchanged, unintelligible to others, have been easily interpreted by the Indian as the signs of a secret and mutual understanding between them. "The Lone Ranche" by Captain Mayne Reid
  2. I murmured some unintelligible excuse, and left the room. "Mabel's Mistake" by Ann S. Stephens
  3. Beginning to look at the matter in rather a serious light, I mounted my horse, when he grunted at me in an unintelligible way, which showed me plainly that he was without the power of speech. "Through Five Republics on Horseback" by G. Whitfield Ray

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