unexplained
adjective /ˌʌnɪkˈspleɪnd/
/ˌʌnɪkˈspleɪnd/
- 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.
Oxford Collocations DictionaryUnexplained is used with these nouns:- absence
- death
- disappearance
- …