cryptic

cryptic
/ˈkrɪptɪk; `krɪptɪk/ adj
with a meaning that is hidden or not easily understood; mysterious 含有隐义的; 晦涩难懂的; 神秘的
    a cryptic remark, message, smile, etc 令人困惑的言语、 信息、 微笑等.

牛津英汉双解词典