Longman Dictionary of Contemporary English homepage

mysterious

 adjective
     
mys‧te‧ri‧ous
1 mysterious events or situations are difficult to explain or understand:
The police are investigating the mysterious deaths of children at the hospital.
Benson later disappeared in mysterious circumstances.
There's something mysterious going on.
2 a mysterious person is someone who you know very little about and who seems strange or interesting [= enigmatic]:
I decided to find out more about my mysterious new neighbour.
a mysterious stranger
3 someone who behaves in a mysterious way says very little about what they are doing, in a way that makes you want to know more [= secretive]
mysterious about
Helen's being very mysterious about her plans.
She hid her thoughts behind a mysterious smile.
—mysteriously adverb:
Jackson had mysteriously disappeared.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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