問題外だ

out of the question

→ 問題外
phrase Rare #23,988
out of the question Indicates that something is unacceptable, impossible, irrelevant, or not worth considering. When used about a person, it can mean they are excluded or not a viable option.
JA: この値段では、その車を買うのは問題外だ。
EN: At this price, buying that car is out of the question.

彼は問題外だ

He's out of the question.

彼の提案は問題外だ

His proposal is out of the question.

彼の理論を理解することは問題外だ

Understanding his theory is out of the question.

そんな些細な事は問題外だ

Such a trivial matter is out of the question.

彼の意見は問題外だ

His opinion is out of the question.

それは問題外だ

That's out of the question.