error in judgment; misjudgment
Refers to a mistake in perception or assessment, often due to oversight or misreading a situation.
彼の判断は目違いだった。
His judgment was mistaken.
それ
That's just an error in judgment.
Compound of 目 (eye, perception) and 違い (difference, mistake), literally 'eye-mistake'. The exact historical derivation is uncertain, but the word has been used to mean an error in judgment or perception.