Describes behavior that is excessively polite or reserved, as if treating a close friend or family member like a stranger. Often used in negative contexts to criticize unnecessary formality.
親
友
な
の
に
、
そんな
他
人
行
儀
な
話
し
方
は
やめ
て
よ
。
We're close friends, so stop talking to me like a stranger.
