Meaning of “mysterious” in the English Dictionary

"mysterious" in British English

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mysteriousadjective

uk /mɪˈstɪə.ri.əs/ us /mɪˈstɪr.i.əs/
mysteriously
adverb uk /mɪˈstɪə.ri.əs.li/ us /mɪˈstɪr.i.əs.li/

C1

"Perhaps, and perhaps not," she said mysteriously.
Mysteriously, the light came on, although no one was near the switch.

(Definition of “mysterious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)