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English definition of “mysterious”

mysterious

adjective     /mɪˈstɪə.ri.əs/ US  /-ˈstɪr.i-/
B2 strange, not known, or not understood: She's an actress whose inner life has remained mysterious, despite the many interviews she has given. He died in mysterious circumstances, and there is still a possibility that it was murder.Confusion, confusing and feeling confused mysteriously     /-li/ adverb C1 "Perhaps, and perhaps not," she said mysteriously. Mysteriously, the light came on, although no one was near the switch.Confusion, confusing and feeling confused
(Definition of mysterious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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