1. inscrutable That is mysterious in the true sense which is beyond human comprehension, as the decrees of God or the origin of life. That is mystic or mystical which has associated with it some hidden or Synonyms: mysterious, abstruse, inexplicable, recondite, cabalistic, inscrutable, secret, dark, mystic, transcendental, enigmatical, mystical, unfathomable, hidden, obscure, unfathomed, incomprehensible, occult, unknown