B1 adjective /ˈtʃaɪl.dɪʃ/
Childish
孩子气; 典型的儿童行为,但对于成年人不合适
Meaning
immature and silly; behaving in a way that is typical of a child but inappropriate for an adult
Example
His childish behavior during the meeting was quite embarrassing.
他在会议期间的孩子气行为非常令人尴尬。