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She wore a mysterious smile.
Having an unknown or secret quality.
The book had a mysterious plot.
He received a mysterious letter.
They discovered a mysterious cave.
mysterious figure
mysterious circumstances
mysterious past
enigmatic
secretive
unfathomable
The book has a mysterious ending.
Something that is difficult to understand or explain.
The painting has a mysterious quality.
She received a mysterious letter in the mail.
His sudden disappearance was quite mysterious.
mysterious figure
mysterious circumstances
mysterious past
enigmatic
unclear
puzzling