un‧ex‧plained /ˌʌnɪkˈspleɪnd◂/ adjective
[Word Family: adjective: unexplained, explanatory, explicable ≠ inexplicable; noun: explaining, explanation; verb: explain; adverb: inexplicably]
something that is unexplained is something you cannot understand because you do not know the reason for it:
patients with unexplained symptoms
For some unexplained reason, he wants to move to Ipswich.

[TahlilGaran] Dictionary of Contemporary English ▲