/ ˌʌnɪkˈspleɪnd; NAmE / adjective
for which the reason or cause is not known; that has not been explained :
an unexplained mystery
He died in unexplained circumstances.
/ ˌʌnɪkˈspleɪnd; NAmE / adjective
for which the reason or cause is not known; that has not been explained :
an unexplained mystery
He died in unexplained circumstances.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005