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e·nig·ma
/iˈniɡmə,eˈniɡmə/
noun
a person or thing that is mysterious, puzzling, or difficult to understand.
"Madeleine was still an enigma to him"
Similar:
mystery
puzzle
riddle
conundrum
paradox
problem
unsolved problem
question
question mark
quandary
a closed book
poser