1. a person who is extremely self-centered and has an obsessive concern with themselves

Examples

• The celebrity’s constant need for attention revealed him to be a complete egomaniac.
• She called her boss an egomaniac because he only talked about his own achievements.
• The politician was such an egomaniac that he couldn’t accept any criticism.
• His egomaniac tendencies made it difficult for him to maintain friendships.
• The director’s reputation as an egomaniac preceded him wherever he went.
• Everyone avoided working with the egomaniac who took credit for others’ ideas.