puerile

Immature, especially in being silly or trivial; childish. synonym: young.

Belonging to childhood; juvenile.

Of or pertaining to a boy or child; boyish; childish; juvenile.

Hence Merely childish; lacking intellectual force; trivial: as, a puerile criticism.

Synonyms Juvenile, Boyish, etc. (see youthful).

Weak, foolish, silly.

Boyish; childish; trifling; silly.

Characteristic of, or pertaining to, a boy or boys; confer: puellile.

Childish; trifling; silly.

of or characteristic of a child