グレーゾーン

noun

gray zone; gray area

Refers to an ambiguous or borderline situation, area, or category that is neither clearly one thing nor another. Used in various contexts such as law, ethics, and classification.

• その行こう為いは法ほう律りつのグレーゾーンに当あたる。

  That act falls into a legal gray zone.

• この問もん題だいは白しろ黒くろつけられないグレーゾーンだ。

  This issue is a gray area that can't be judged simply as right or wrong.