An inscrutable person is someone who is difficult to understand or interpret. This term can be described by three words: SPHINX (6 letters), ENIGMA (6 letters), and Pokerface (9 letters). A SPHINX is a mythical creature with the body of a lion and the head of a human, often used as a symbol of mystery and ENIGMA. An ENIGMA is a puzzle or riddle that is difficult to solve. A pokerface is an expressionless face used to conceal one's true feelings or intentions. All of these terms describe an inscrutable person, someone who is mysterious and hard to read.