noun
right and wrong; justice and injustice
Formal term used in discussions of morality, law, or ethics to distinguish what is right from what is wrong.
理非をわきまえた行動をとるべきだ。
You should act with a clear sense of right and wrong.
裁判では理非を明らかにすることが求められる。
In a trial, it is required to clarify what is right and what is wrong.