The kids became too raucous on the playground, so the teacher had to stop them.

raucous 是形容词，意思是"喧闹的、刺耳的"，通常用来形容声音很大且不和谐的情况。这个词来自拉丁语 raucus（嘶哑的），描述那种粗糙刺耳的声音。