Enigma – A person or thing that is mysterious or hard to understand

(Pronounced in-ig-muh)

The enigma machine in Bletchley Park, England is difficult to understand.

Note: The enigma machine was employed extensively by Nazi Germany during World War II to protect military communication.

Examples of enigma in a sentence

Even after all these years John still remains an enigma to me.

The magician’s trick was an enigma to everyone in the audience.

The bestselling author never left his house, he was an enigma to his fans.