unexplained
adjective B2- Not explained; of unknown cause or origin.
From the library
It is, as I gather from your original remarks, an inexplicable, or at least an unexplained, murder.
At the same time, there is much that is unexplained, and I should strongly recommend that you ask Mr.
“It does, Sherlock, and yet it leaves so much unexplained.
“You have, no doubt, described the sequence of events correctly, but there is one point which you have left unexplained.
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