childish

Meanings

1. 1
   adj

   Behaving in a silly, immature way that you would not expect from an adult.

   Your childish tantrums won't change my mind.

2. 2
   adj

   Typical of or suitable for a child.

   This game is too childish for teenagers.

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

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