Formal:
* "The young man's impudent remarks towards the esteemed professor were met with a frosty silence."
* "The defendant's lawyer argued that his client's actions, while impudent, were not intended to be malicious."
Informal:
* "My little sister can be so impudent sometimes, but she always makes me laugh."
* "I was shocked by the waiter's impudent attitude when I asked for a different table."
Literary:
* "Her impudent smile was a challenge, a dare to the world to judge her."
* "The king, known for his stern demeanor, was surprisingly amused by the jester's impudent antics."
Note: Impudent often carries a negative connotation, implying disrespect or arrogance.