childish

adj

1. Immature in thought or behaviour.

   “Your childish temper tantrums are not going to change my decision on this matter.”

2. Suitable for or expected of a child.

   “This game is very childish.”

   “She remembered, too, when, after a long childish illness, her father had carried her in his arms to the garden, […]”

   “As I walked to and fro daily between Southwark and Blackfriars, and lounged about at meal-times in obscure streets, the stones of which may, for anything I know, be worn at this moment by my childish feet, I wonder how many of these people were wanting in the crowd that used to come filing before me in review again, to the echo of Captain Hopkins’s voice!”