1 that you do not understand or cannot explain; strange 神秘的；无法解释的；奇怪的: Several people reported seeing mysterious lights in the sky. 有几个人报称看见天空中出现神秘的光。

2 (used about a person) keeping sth secret or refusing to explain sth （指人）神秘的，诡秘的: They're being very mysterious about where they're going this evening. 他们对于今天晚上要去哪里，表现得十分神秘。 ➔mysteriously adv