- 1difficult to understand or explain; strange He died in mysterious circumstances. A mysterious illness is affecting all the animals.
- 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(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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