incomprehensible
in-com-pre-hen-si-ble
adjective
Impossible to understand or comprehend; beyond human grasp or mental capacity.
"His instructions were utterly incomprehensible."
Thesaurus
Synonyms: obscure, enigmatic, lost, missed, unfathomable, enigmatical, indecipherable, uncomprehensible, puzzling, impenetrable, unintelligible, opaque
Antonyms: comprehendible, comprehensible, explicable