The inspiration for the work could be the drawings of Hogarth and others, in which grownups often act childishly.

Pike is naive and acts childishly; he has limited grasp of adult issues.

He is quite confident and sometimes acts childishly.

They both apologize for acting childishly, and they leave the dinner together.

As usual, some cooler part of himself knew that he was acting childishly.

Although, with Team Guts themselves, he sometimes act childishly to get some attention from the team.

There have been several instances where she acts rather childishly.

She is actually very lonely, and she acts childishly.

By being an adolescent or young adult, Yukito sometimes acts childishly if provoked.

She'd treated Halphemos like a child, and quite naturally he'd acted childishly as a result.