Synonyms: opaque, unintelligible
Definition: not clearly understood or expressed
Similar words: incomprehensible, uncomprehensible
Definition: difficult to understand
Usage: the most incomprehensible thing about the universe is that it is comprehensible- A. Einstein
Synonyms: unintelligible
Definition: poorly articulated or enunciated, or drowned by noise
Usage: unintelligible speech
Definition: spoken as if with a thick tongue
Usage: the thick speech of a drunkard; his words were slurred