infantile
US
UK infantile adj: (childish)
SC 幼稚的 yòu zhì de
SC 孩子气的 yòu zhì de ，hái zi qì de
TC 孩子氣的
TC 孩子氣的
The tantrum was infantile, and definitely not appropriate for a 10 year old.
infantile adj: figurative (early in development)
SC 幼稚的 yòu zhì de
SC 婴儿期的
The infantile plan started to take real shape during the meeting.
infantile adj: (appearing like a child)
SC 孩子气的 hái zi qì de
TC 孩子氣的
TC 孩子氣的
The man had a strangely infantile face.