unexplained /ˌʌnɪkˈspleɪnd/ adjective /ˌʌnɪkˈspleɪnd/
adjective
Learner's definition of UNEXPLAINED
: having no known reason or cause : not explained原因不明的;未做解释的 -
an unexplained death/illness原因不明的死亡/疾病
-
For some unexplained reason, the plane went off course.不知何故,飞机偏离了航线。