Egoist (noun)

A person who is excessively self-centered and concerned with their own wants and needs, often at the expense of others.

Origin:

From the word "ego" meaning self, it refers to a person who is excessively self-centered and concerned with their own wants and needs, often at the expense of others.

Examples:

1. He was criticized for being an egoist and putting his own interests above those of his colleagues.
2. She was accused of being an egoist for her refusal to share credit for her team's accomplishments.
3. The egoist's behavior caused a rift in the group.
4. The egoist was always looking out for his own interests.
5. The egoist's actions were driven by a desire for personal gain.