A "yesman" is someone who always agrees with their superiors or colleagues, often regardless of their own opinions or beliefs. Synonyms for "yesman" include "sycophant," "lickspittle," "toady," "flatterer," "brownnoser," and "apple-polisher." All of these terms suggest a lack of individuality, integrity, and critical thinking. They can be used to describe someone who blindly follows orders or conforms to groupthink, often at the expense of personal values or principles. It is important to recognize and avoid "yesmen" in the workplace or social circles, as they can hinder progress, stifle creativity, and create an unhealthy power dynamic.