childish

adj

Etymology: From Middle English childisch, from Old English ċildisċ. By surface analysis, child + -ish.

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, […]”