見み境さかいがつかない

expression, i-adjective

cannot tell one thing from another; cannot distinguish (e.g. good from bad)

Used when someone loses the ability to make distinctions, often due to strong emotion, intoxication, or obsession. Commonly appears in negative form 見境がつかない.

See also: 付く (つく)

• 彼かれは怒いかりで見み境さかいがつかなくなった。

  He lost the ability to distinguish right from wrong in his anger.

• 酔よっ払ぱらって見み境さかいがつかない状じょう態たいだった。

  He was so drunk he couldn't tell one thing from another.