*mys·te·ri·ous/mɪs`tɪrɪəs; mɪˈstɪəriəs/ adj 1 strange and difficult to explain or understand 神秘的，难以解释［理解］的: a mysterious illness 神秘的疾病 2 not saying much about something, because you want it to be a secret 秘密的，保密的; 遮遮掩掩的: He's being very mysterious about his new girl-friend. 他对自己有新女友的事一直守口如瓶。