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Enigma
01
the quality of being very challenging to explain or understand
02
a puzzling or mysterious issue or situation
Example
His motives for the decision were an enigma to his colleagues.
The sudden disappearance of the airplane over the ocean is one of aviation's greatest enigmas.
Despite numerous theories, the cause of the phenomenon is still an enigma.
The missing artifact remained an enigma to the researchers.
She always had an air of mystery around her, making her an enigma to even her closest friends.
