No. 3,055 in French

mystérieux

"Mystérieux" means "mysterious" in English.

In a sentence

Le château est mystérieux et plein de légendes.
The castle is mysterious and full of legends.
Describes an attribute of the castle as being intriguing and unexplained.
Un étranger mystérieux est apparu au village hier soir.
A mysterious stranger appeared in the village last night.
Qualifies the stranger as unknown and enigmatic.
Il a un comportement mystérieux qui intrigue tout le monde.
He has a mysterious behavior that intrigues everyone.
References the behavior as being puzzling and not straightforward.

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