Fat-headed is an insulting term that refers to people who are self-absorbed, arrogant and ignorant. There are many synonyms that can be used to describe these kinds of people, such as conceited, egotistical, haughty, pompous, pretentious, self-important, vain, and snobbish. These terms all suggest that the person in question has an inflated sense of their own importance and intelligence. Other more colorful synonyms include "bigheaded," "headstrong," "pigheaded," and "thickheaded." These terms emphasize the stubbornness and ignorance that often accompany such attitudes. Whatever the term used, it is clear that fat-headed people are not highly regarded by others.