rowdy(noun, adjective) adjective1. disturbing the public peace; loud and rough- rowdy teenagersSimilar word(s): disorderly, raucous noun1. a cruel and brutal fellowSimilar word(s): bully, hooligan, roughneck, ruffian, tough, yob, yobbo, yoboDefinition categories: person, aggressor, assailant, assaulter, attacker