impudent
词根词缀：
impudence n. 厚颜无耻
im 不 + pud 感到羞耻 + ence 表行为 → 厚颜无耻
impudent adj. 无礼的
im 不 + pud 感到羞耻 + ent 具有…性质的，关于…的 → 不知羞耻 → 无礼的
impudicity n. 不谦恭；无耻
im 不 + pud 感到羞耻 + icity 具备某种性质 → 不知羞耻 → 无耻
pudency n. 羞怯；谦逊
pud 感到羞耻 + ency 表状态 → 羞怯；谦逊
repudiate v. 拒绝；抛弃
re 反 + pudi〔= pud〕感到羞耻 + ate 做，造成，使… → 反过来让对方羞耻 → 拒绝〔别人〕
数据来源：新东方英语词汇速记大全
相关例句：
It was impudent of her to answer like that.
她竟那样回答，真太放肆了。
Your letter is impudent and it has angered me.
你的信很放肆，使我很生气。
Come here, you impudent rascal, was the lodger's answer as he re-entered his room.
“进来，你这个莽撞的流氓！”在他重新回到他的房间里时，他来了这样一个回答。
I find the question as insulting as it is impudent.
我觉得这个问题是对我无礼的侮辱。
Go on with your work, you impudent slut!
干你的活去，你这不要脸的邋遢女人！
Why will you tolerate that impudent fellow?
你为什麽要忍受那个冒失的家伙呢？