Which adjective describes something that is "highly offensive"?

The adjective "obnoxious" accurately describes something that is "highly offensive." This term conveys a strong negative connotation, suggesting behavior or qualities that are not only unpleasant but also irritating or intolerable to others. For instance, if someone's actions or words are deemed obnoxious, they provoke a strong reaction due to their offensive nature.

In contrast, the other choices signify positive or neutral qualities. "Pleasant" and "friendly" suggest agreeable and enjoyable characteristics, while "inviting" denotes warmth and appeal. None of these terms align with the notion of being highly offensive, which is why they do not serve as appropriate descriptions in this context.