childish
//ˈtʃaɪldɪʃ//
Adjective
childishCanonical form
more childishComparative
most childishSuperlative
1
Resembling or characteristic of a child, especially in being silly, immature, or petulant.
Stop being so childish and apologize to your sister.
2
Of, relating to, or suitable for a child.
She decorated the room with childish drawings and colorful balloons.