Definition of unexplained adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌnɪkˈspleɪnd//
; NAmE NAmE//ˌʌnɪkˈspleɪnd//
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for which the reason or cause is not known; that has not been explained an unexplained mystery He died in unexplained circumstances. The reason for her strange behaviour remained unexplained.
See the Oxford Advanced American Dictionary entry: unexplained