0 not able to be understood: --
He muttered something unintelligible.
1 (of speech or writing) not clear enough to be understood --
The two men were singing, swooping, undulating, unintelligible words, and the back of my neck tingled.
Utterance attempts included those utterances that were completely intelligible, partly intelligible or completely unintelligible.
First, only fully intelligible utterances were coded; all utterances with unintelligible portions were excluded.
Utterances containing unintelligible portions were omitted from analyses.
These are usually glossed as unintelligible syllables if they are transcribed at all.
What is compelling or comprehensible to one person may be uninteresting or unintelligible to another.
This is probably why experimental work is often criticized for being unintelligible or too zany to be held to the same standards as orthodox writing.
Fourth, by ' mystery ' some mean an unintelligible doctrine, the meaning of which can't be grasped.