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English definition of “mystery”

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mystery

noun [C/U]  /ˈmɪs·tə·ri/ us  
something strange or unknown which has not yet been explained or understood: [C] Despite years of study, sleepwalking remains a mystery. [U] The details of the scandal are shrouded in mystery. A mystery is also a book, movie, or play about a crime or other event that is difficult to explain: [C] a murder mystery
mysterious
adjective  /mɪˈstɪər·i·əs/ us  
He tried to convince this mysterious woman to go out with him.
mysteriously
adverb  /mɪˈstɪər·i·əs·li/ us  
The light mysteriously came on, although no one was near the switch.
(Definition of mystery from the Cambridge Academic Content Dictionary © Cambridge University Press)
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