An immoral or harmful act; a misdeed or wrongdoing.
彼の悪行がついに暴露された。
His misdeeds were finally exposed.
その組織は長年にわたり悪行を重ねてきた。
The organization has repeatedly committed wrongdoing for many years.
どんな理由があっても他人に危害を加えるのは悪行だ。
No matter the reason, harming others is a misdeed.