When it comes to identifying synonyms for the term "big head," several words come to mind. Some of the most commonly used include "egotistical," "arrogant," "conceited," "pompous," and "self-absorbed." Other possible options might include "self-important," "vainglorious," "overweening," "exaggerated," and "boastful." All of these terms imply an over-inflated sense of self and a tendency to boast or put oneself above others. While sometimes used in a playful or humorous way, having a "big head" can be a serious character flaw, leading to a lack of empathy, difficulty working in teams, and an inability to take constructive criticism.