adj. 25B6; adjective UNINTELLIGIBLE, impossible to understand, impenetrable, unclear, indecipherable, beyond one's comprehension, beyond one, beyond one's grasp, complicated, complex, involved, baffling, bewildering, mystifying, puzzling, confusing, perplexing; abstruse, esoteric, recondite, arcane, mysterious, Delphic; informal over one's head, all Greek to someone; Brit. informal double Dutch.
intelligible, clear.