Meaning of the word mysterious in English

What does mysterious mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

mysterious

US /mɪˈstɪr.i.əs/
UK /mɪˈstɪə.ri.əs/
"mysterious" picture

Adjective

difficult or impossible to understand, explain, or identify

Example:
The disappearance of the ancient artifact remains a mysterious case.
She had a mysterious smile that made him wonder.