Being such that understanding or comprehension is difficult or impossible; incomprehensible: unintelligible remarks; an unintelligible prose passage. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unintelligible" in a sentence
"The second explains - in as much as an explanation of the unintelligible is even possible - why the publishing industry behaves as it does."
"Notebooks full of unintelligible notes scattered in unintelligible heaps."
"No. However, it was Bush's fault that his education cuts have resulted in unintelligible posts authored by, well, you."