rude

A rude person acts thoughtlessly and doesn't care about others' feelings.

When people say someone is being rude, they usually mean that this person isn't considering how their words or actions might affect others. They might interrupt conversations, not listen to what you're saying, or even shout at you. A rude person can be inconsiderate of other people's needs, time, or emotions. Think about a situation where someone cuts off another driver on the road without apologizing - that's an example of rudeness. Even small actions like walking into a room without knocking or not holding a door open for someone behind you can be seen as rude if it shows a lack of consideration for others.