expression, noun
sign of remorse; indication of regret
Used when someone's expression, attitude, or behavior shows they feel sorry for what they did. Often appears in negative contexts like 反省の色がない (shows no sign of remorse).
彼は反省の色を全く見せなかった。
He showed no sign of remorse at all.
反省の色が感じられない態度だった。
It was an attitude that showed no indication of regret.