Refers to the principle or attitude of prioritizing one's own interests above others. Often used in ethical, social, or psychological contexts.
His actions are based on selfishness.
利己主義は社会の調和を乱すことがある。
Egoism can sometimes disrupt social harmony.
He is often criticized for being egoistic.
During the crisis, people gave in to selfishness.
His egoistic way of thinking became a problem.