childish
US /ˈtʃaɪl.dɪʃ/
UK /ˈtʃaɪl.dɪʃ/

1.
子供っぽい, 幼稚な
of, like, or appropriate to a child
:
•
She has a very childish handwriting.
彼女はとても子供っぽい字を書く。
•
His behavior was quite childish for his age.
彼の行動は年齢の割にはかなり子供っぽいものだった。
子供っぽい, 幼稚な
of, like, or appropriate to a child