Rowdy means noisy, disorderly, and boisterous in a way that's hard to control. A rowdy crowd at a concert might be shouting, pushing, and creating chaos. A rowdy classroom gets so loud and wild that the teacher can barely get anyone's attention.

The word captures unruly, uncontrolled energy that goes beyond ordinary noise. A group of friends laughing and talking might be noisy, but they become rowdy when they start roughhousing, knocking things over, or ignoring requests to settle down. Rowdy behavior involves losing control and disrupting the space around you.

You might hear about rowdy fans at a sporting event or a rowdy party that disturbs the neighbors. Sometimes young children get rowdy when they're excited or overtired, running around and making too much noise. The word implies that someone needs to step in and restore order, whether that's a parent, teacher, or security guard. Being rowdy means you've crossed the line into disrupting others or losing control of the situation.