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

1.
kekanak-kanakan, seperti anak kecil
of, like, or appropriate to a child
:
•
She has a very childish handwriting.
Dia memiliki tulisan tangan yang sangat kekanak-kanakan.
•
His behavior was quite childish for his age.
Perilakunya cukup kekanak-kanakan untuk usianya.