childish

US /ˈtʃaɪl.dɪʃ/
UK /ˈtʃaɪl.dɪʃ/
"childish" picture
1.

kindisch, kindlich

of, like, or appropriate to a child

:
She has a very childish handwriting.
Sie hat eine sehr kindliche Handschrift.
His behavior was quite childish for his age.
Sein Verhalten war für sein Alter ziemlich kindisch.