orphic, arcane, cabalistic, rich, recondite, inexplicable, occult, kabbalistic, incomprehensible, abstruse, cryptical, secret, thick, bass, puzzling, explain, deep, knowledge, sibylline, mystical, mystic, inscrutable, qabalistic
unintelligible (part of speech: adjective)
- And there were all sorts of things, things touching, amusing, mystifying- and above all such an instance as I had never yet met- in this funny little fortune of the useful American cousin. - "The Beldonald Holbein", Henry James.
- Miss Saunders nodded slowly, bit her lip, and stared at Susan in a rather mystifying and very pronounced way. - "Saturday's Child", Kathleen Norris.
- I held it to my face, and that faint perfume that had been a mystifying accompaniment of the passing of the mansion ghost became nothing more unreal than the orris in Hezekiah's handkerchief- case. - "The Siege of the Seven Suitors", Meredith Nicholson.