Bratty describes behavior that's whiny, demanding, and selfishly inconsiderate of others. When someone acts bratty, they complain constantly, insist on getting their way, and throw fits when things don't go exactly as they want.

Picture a child in a store throwing a tantrum because their parent won't buy them a toy, or a teammate who pouts and refuses to play when they don't get chosen as captain. That's bratty behavior. The word suggests someone is acting immature and entitled, like they believe the world should revolve around them.

You might hear someone called a brat (the noun form), which means a person who regularly acts this way. Interestingly, while the word often describes children, adults can act bratty too. An adult who demands special treatment at a restaurant or sulks when they don't get the best seat is displaying bratty behavior.

The word carries a sharp criticism. Calling someone bratty suggests they need to grow up and consider others. Most people recognize bratty behavior when they see it and find it unpleasant.