American English

Definition of mysterious adjective from the Oxford Advanced American Dictionary



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  1. 1difficult to understand or explain; strange He died in mysterious circumstances. A mysterious illness is affecting all the animals.
  2. 2(especially of people) strange and interesting because you do not know much about them synonym enigmatic A mysterious young woman is living next door.
  3. 3(of people) not saying much about something, especially when other people want to know more He was being very mysterious about where he was going.
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adverb My watch had mysteriously disappeared. Mysteriously, the streets were deserted. She was silent, smiling mysteriously.
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: mysterious