Egomania (noun)

An excessive or abnormal egotism, self-obsession, or self-importance.

Origin:

From the word "ego" meaning self, and "mania" meaning an obsession or excessive enthusiasm, it refers to an excessive or abnormal egotism, self-obsession, or self-importance.

Examples:

1. His egomania made it difficult for him to work with others.
2. The CEO's egomania was a major problem for the company.
3. The politician's egomania caused him to make a series of poor decisions.
4. The celebrity's egomania led to a series of public relations disasters.
5. His egomania resulted in a toxic work environment.