egomaniacal
/ˌiːɡoʊməˈnaɪəkəl/
adjective
- Having an extreme and unhealthy obsession with oneself; thinking only about one's own needs, desires, or importance.
- His egomaniacal behavior made it impossible for the team to work together.
- She became so egomaniacal after her success that she stopped listening to anyone else.
- The CEO's egomaniacal demands drove away the company's best employees.