act up 捣乱，表现不好
His little boy is 3 and likes to act up in front of others.
talkative /ˈtɑː.kə.t̬ɪv/ 爱说话的，健谈的；
My boss is so talkative that nobody likes to talk to him.
chatty /ˈtʃæt̬.i/ 爱闲聊的；健谈的
You're very chatty today. What's the problem?
mouthy /ˈmaʊ.ði/ 多嘴的
Ben used to be a mouthy young boy.
She hardly said a word until she was two, but now she's a little chatterbox.