Unresolved; not yet solved — referring to a problem, case, or issue that remains open or pending.
その事件は長年未解決のまま残っている。
That case has remained unsolved for many years.
未解決の問題を後回しにすると、さらに悪化することがある。
If you put unresolved problems off, they can sometimes get worse.
未解決の疑問点は会議で全員に確認しよう。
Let's confirm the unresolved questions with everyone at the meeting.