rationale (根拠): The rationale behind the decision was not clear. (その決定の根拠は明確ではありませんでした) - 試験に出る! 英単語検索辞書

rationale (根拠): The rationale behind the decision was not clear. (その決定の根拠は明確ではありませんでした)

The rationale behind the decision was not clear.