If you describe someone as self-interested, you disapprove of them because they always want to do what is best for themselves rather than for other people.
[disapproval]
...self-interested behaviour.
Synonyms: selfish, self-centred, egotistical, greedy More Synonyms of self-interested
Examples of 'self-interested' in a sentence
self-interested
Secondly, it is often supposed that they are narrowly self-interested.
Hindess, Barry Choice, Rationality, and Social Theory (1988)
What matters for the rational choice model is that all preferences are comparable, not that they are narrowly self-interested.
Hindess, Barry Choice, Rationality, and Social Theory (1988)