Definition of inscrutable :
Unsearchable; incapable of being searched into and understood by inquiry or study; impossible or difficult to be explained or accounted for satisfactorily; obscure; incomprehensible; as, an inscrutable design or event.
secret, bass, transcendental, obscure, occult, mysterious, cryptic, difficult, mystifying, abstruse, unintelligible, dark, mystical, inexplicable, hidden, knowledge, kabbalistic, unfathomable, deep, cabalistic, unfathomed, enigmatical, study at mysterious, orphic, uncomprehensible, rich, sibylline, qabalistic, incomprehensible, recondite, impenetrable, mystic, unknown, cryptical, blank, thick
unexcitable (part of speech: adjective)
frigid, cold-blooded, dispassionate, impassive, easygoing, stoical, staid, calm, unexcitable, stoic, even-tempered, unflappable, stolid, self-controlled, moderate, composed, placid, tranquil, unhurried, aloof, cool, neutral, imperturbable, self-composed, poker-faced, level-headed, mild, controlled, numb, demure, deadpan, nonchalant, steady, serene, passionless, apathetic, meek, reserved, detached
- His eyes, again inscrutable, sought the clock; his face, once more an impassive mask, was turned toward the door. - "The Lash", Olin L. Lyman.
- Mr. Hall's strongly marked face was inscrutable. - "Home Fires in France", Dorothy Canfield.
- The Buddha's eyes quietly looked to the ground; quietly, in perfect equanimity his inscrutable face was smiling. - "Siddhartha", Herman Hesse.