mysterious - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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English definition of “mysterious”

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mysterious

adjective uk   /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.
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mysteriously
adverb uk   us   /-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 Learners Dictionary & Thesaurus © Cambridge University Press)
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