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Enigma
01
the quality of being very challenging to explain or understand
Example
She always had an air of mystery around her, making her an enigma to even her closest friends.
The sudden disappearance of the airplane over the ocean is one of aviation 's greatest enigmas.
The missing artifact remained an enigma to the researchers.
02
a puzzling or mysterious issue or situation
Example
The coded letter from the spy was an enigma, and they needed their best cryptographer to decipher it.
The reason for the sudden disappearance of the species remains an enigma to scientists.
