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A misdeed is a wrong thing someone has done — not a small slip, like spilling tea, but a real bad act. It can be against the law (stealing, lying in court), or against what a group calls right (hurting someone, cheating, breaking a serious promise). The word feels a bit old and formal. Teachers, judges, newspapers, and religious writing still use it; friends talking about last night usually say something simpler, like a bad thing, a crime, or what he did. People sometimes stretch it for comic effect — calling a tiny mistake a misdeed — but they are joking. One misdeed is one act; a person can have many. It names the act, not the person.
惡行、壞事（偏正式；口語較常說「幹了壞事」）
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
misdeednoun/mɪsˈdiːd/
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That which was done that should not have been, ranging from any sin or moral offense to various degrees of crime.
- The petty misdeeds of his youth came back to haunt him when he ran for political office and his character was smeared.
- These [putting feet on seats and leaving rubbish behind] are officially among the worst habits revealed by staff working on Northern's trains and at stations. Other bugbears include playing music through loudspeakers, not giving way to passengers getting off the train and actually illegal activities such as fare evasion and vaping in enclosed spaces. The list of misdeeds was released by the operator on March 3 to coincide with Employee Appreciation Day.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。