selfish

An act that shows someone only cares about themselves and what they want is considered selfish.

When we talk about being selfish, it's usually because someone has done something to benefit themselves but hurt others. For example, imagine your friend wants to borrow money from you, but then uses it all for a vacation instead of paying off some bills you lent them for. You might think that was a selfish thing to do because they didn't consider how it would affect you and your relationship.