Douglas Harper's Etymology Dictionary
uncomprehensible
late 14c., from un- (1) "not" + comprehensible. The usual word is incomprehensible.
Wiktionary
uncomprehensible
a. incomprehensible.
WordNet
uncomprehensible
adj. difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein [syn: incomprehensible] [ant: comprehensible]
Usage examples of "uncomprehensible".
She had come to beg his forgiveness, and he threw derogatory, uncomprehensible comments in her face.
Equally unbelievably, it was to precipitate universal chaos on an uncomprehensible scale.
Was it even now looking down on them from some uncomprehensible alien OI-YMPUS and musing on their problems?