C1 noun /ˈiːɡoʊˌɪzəm/
egoism
эгоизм
Meaning
An ethical theory that treats self-interest as the foundation of morality; also, excessive preoccupation with oneself.
Example
His decisions were often driven by egoism rather than concern for others.
Его решения часто были продиктованы эгоизмом, а не заботой о других.