Meaning of “mysterious” in the English Dictionary

"mysterious" in British English

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uk /mɪˈstɪə.ri.əs/ us /mɪˈstɪr.i.əs/

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.

More examples

  • All the rose bushes seem to be suffering from the same mysterious malady.
  • She claims to have occult powers, given to her by some mysterious spirit.
  • These mysterious creatures live at the bottom of the ocean.
  • When I got home, I found a mysterious message sellotaped to the front door.
  • She wondered who'd sent her the mysterious email.
adverb uk /mɪˈstɪə.ri.ə us /mɪˈstɪr.i.ə


"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)