incomprehensible, uncomprehensible

difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein

• dark, obscure — marked by difficulty of style or expression
• enigmatic, enigmatical, puzzling — not clear to the understanding
• impenetrable — impossible to understand
• indecipherable — impossible to determine the meaning of
• lost, missed — not caught with the senses or the mind
• opaque, unintelligible — not clearly understood or expressed