Usage Note
Mystérieusement is formed regularly from mystérieux/mystérieuse + -ment. It modifies verbs and adjectives to indicate something happened in a mysterious or unexplained way. The related adjective mystérieux/mystérieuse and the noun mystère (m) share the same family. It appears frequently in crime fiction and news reports about unexplained events.
Examples
"Il a mystérieusement disparu hier soir."
Natural Translation
He mysteriously disappeared last night.
Related Words
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