irresponsible

An irresponsible person or action doesn't think about how their behavior affects others. This can happen when someone acts without considering the consequences.

When we say that someone is being irresponsible, it usually means they're not taking care of things properly. For example, if a friend leaves their dirty dishes in the sink for days and expects you to clean them, that's an example of irresponsibility. It's not just about neglecting tasks, though - irresponsible behavior can also be reckless or thoughtless, like driving too fast without wearing a seatbelt. We might see this kind of behavior from people who are young and inexperienced, but it can happen at any age if someone doesn't learn to think about how their actions affect others.