Which of the following terms indicates a lack of respect for others?

The term "supercilious" describes a behavior or attitude characterized by disdain or condescension towards others, often implying a belief in one's own superiority. It encapsulates a lack of respect, as it suggests that the person exhibiting this quality looks down on others as inferior or less deserving of consideration. This term conveys not just a lack of respect, but also an arrogant dismissal of others' worth or opinions.

The other terms provided do not convey the same meaning. "Succor" refers to providing assistance or support, which is inherently respectful and caring. "Upbraid" means to scold or criticize severely, but it doesn't necessarily imply a lack of respect; rather, it indicates a response to perceived wrongdoing. "Tyro" designates a beginner or novice, which does not imply disrespect, but rather a state of learning or inexperience. Therefore, "supercilious" is the most accurate choice for indicating a lack of respect for others.