enigma
/ɪˈnɪɡmə/
noun
- A person, thing, or situation that is mysterious, puzzling, or difficult to understand.
- The old mansion was an enigma, with hidden rooms and strange sounds at night.
- Scientists are still trying to solve the enigma of how the ancient pyramids were built.
- Her sudden decision to quit her job and travel the world remains an enigma to her friends.
- A riddle or puzzle, especially one with a hidden meaning.
- The poet's work is full of enigmas that readers love to decode.
- In the game, each level presents a new enigma that requires logic to solve.
- The Sphinx's enigma challenged all travelers who passed by.