suffix
Suffix attached to nouns denoting a state or condition, often as 〜裏に, meaning 'in the midst of' or 'under the circumstances of'. Used in formal or literary contexts.
成功裏にプロジェクトを終えた。
We completed the project with success.
会談は友好的な雰囲気の裏に行われた。
The talks were held in a friendly atmosphere.
中 (ちゅう) is a more common suffix meaning 'in the middle of' or 'during', while 裏 (り) is more formal and emphasizes the surrounding state or condition.
Derived from the kanji 裏 meaning 'back' or 'reverse side', used here as a suffix to indicate being within a certain state or condition. The exact historical development is uncertain.