unsolved
adjectiveUK /ˌʌnˈsɒlvd/
US /ˌʌnˈsɑːlvd/
Not figured out yet.
The mystery of the missing keys is still unsolved.
OTHER MEANINGS
2. Not yet solved by the police or detectives.
The unsolved case was reopened after ten years.
3. Not worked out or explained in math or science.
The unsolved equation puzzled the whole class.
4. Still without an answer or solution.
Many questions about the ocean remain unsolved.