Mystery noun anything that arouses curiosity or perplexes because it is unexplained, inexplicable, or secret:. Mystery, problem, enigma, riddle, puzzle mean something which baffles or perplexes.
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Something strange or not known that has not yet been explained or understood:. If you talk about the mystery of someone or something, you are talking about how difficult they are to understand or know about, especially when this gives them a rather strange or magical quality.