What term refers to being marked by offensive boldness or insolence?

The term that refers to being marked by offensive boldness or insolence is "impudent." This word describes a person's behavior that is disrespectful or lacking in modesty, often characterized by a disregard for others' authority or feelings. In essence, impudence conveys a sense of brazen boldness, particularly in social interactions where one should typically exhibit more respect or deference.

The other terms, while they may have their own specific meanings, do not convey the same sense of offensive boldness. "Impertinent," for instance, also relates to rudeness or lack of respect, but it may not always imply the same level of boldness associated with "impudent." "Impassive" means showing no emotion or feeling, which is entirely different from being bold or insolent. "Imposing" pertains to something that commands attention or is impressive in appearance, without any implication of disrespect or rudeness.

In summary, "impudent" specifically captures the essence of being audaciously disrespectful, making it the most accurate choice for the definition provided.