Refers to morally or legally wrong acts; often used in serious, formal, or religious contexts. Can imply a sense of guilt or evil.
He acknowledged his crime/sin and deeply regretted it.
It is difficult to build a society without vice.
In that society, drinking alcohol was regarded as a vice.
In his youth, he committed many sins.
悪事 refers to a specific wrongdoing or evil deed someone commits, while 罪悪 is the more abstract concept of sin or moral wrongness itself.
善行 means a good or virtuous deed, the moral opposite of 罪悪, which means sin or vice.
feelings of guilt; guilty conscience
Compound of 罪 (つみ, 'sin, crime') and 悪 (あく, 'evil, bad'). The reading ざいあく is the on'yomi of both characters.