Definition from macmillandictionary.com
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I just can’t think who she could have been – it’s a mystery.
The exact origin of the universe remains a mystery.
The police are trying to unravel the mystery of his disappearance.
Why she left is still a mystery to him.
a woman with an air of mystery about her
His past is shrouded in mystery.
David’s always been a bit of a mystery.
an Ellery Queen mystery
You’ll learn all about the mysteries of the darkroom and printing processes.
the mystery of salvation
belief in the Eucharistic mystery
The initiates in the Eleusinian mysteries hoped for a rebirth of Dionysus.