Which term best describes someone who is "impudent"?

The term "impudent" is best defined as exhibiting a lack of respect or showing brazen disregard for others. It characterizes a person who acts with a sense of boldness or audacity that crosses the line into disrespectfulness. This aligns perfectly with the meaning of being "marked by casual disrespect," as it emphasizes an attitude that is not just rude but done with a certain nonchalance or ease.

In contrast, the other choices present characteristics that are the opposite of what "impudent" conveys. Being respectful and polite, for instance, entirely contradicts the disrespect inherent in impudence. Similarly, being shy and reserved describes a lack of boldness and engagement with others, while kind and gentle traits imply compassion and consideration, which are also inconsistent with impudence. Therefore, the choice that encompasses a direct and fitting representation of "impudent" is one that describes a disposition characterized by casual disrespect.