/ˌʌnɪkˈspleɪnd ||; ˌʌnɪkˈsplend/adj for which the reason or cause is not known; that has not been explained 原因不详的；未解释的；未说明的: an unexplained mystery 解释不清的奥妙 The reason for her strange behaviour remained unexplained. 她怪异行为的原因还是个谜。