childish

Meanings

1. 1
   adj

   indicating a lack of maturity

   childish tantrums

2. 2
   adj

   Immature in thought or behaviour.

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

3. 3
   adj

   Suitable for or expected of a child.

   This game is very childish.

Etymology

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