未み解かい決けつ問もん題だい

noun

unresolved problem; open question

Refers to a problem or issue that has not yet been solved, often used in academic, technical, or formal contexts.

• この未み解かい決けつ問もん題だいは数すう学がく者しゃたちを長なが年ねん悩なやませてきた。

  This unresolved problem has troubled mathematicians for many years.

• 会かい議ぎでは、いくつかの未み解かい決けつ問もん題だいが議ぎ題だいに上あがった。

  Several unresolved issues were brought up at the meeting.