transcription, транскрипция: [ ʌnɪkspleɪnd ]
If you describe something as unexplained , you mean that the reason for it or cause of it is unclear or is not known.
The demonstrations were provoked by the unexplained death of an opposition leader...
Soon after leaving Margate, for some unexplained reason, the train was brought to a standstill...
ADJ : usu ADJ n