Как по Английски будет eigensüchtig

adjective

(of a person, action, or motive) lacking consideration for other people; concerned chiefly with one's own personal profit or pleasure.

Примеры использования:

I joined them for selfish reasons

adverb

With a lack of consideration for other people due to concern with one's own personal profit or pleasure.

Примеры использования:

They continue to act selfishly at the expense of others