Usage Note
Misterioso agrees in gender and number: una figura misteriosa, sucesos misteriosos. The related noun is misterio ('mystery'). In informal speech, misterioso can also describe a person who acts secretive or aloof — se pone muy misterioso means 'he gets very mysterious/secretive.'
Examples
"El extraño tenía una sonrisa misteriosa."
Natural Translation
The stranger had a mysterious smile.

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