Childish Definition

chīldĭsh
adjective
Of, like, or characteristic of a child.
Webster's New World
Not fit for an adult; immature; silly.
Webster's New World
Marked by or indicating a lack of maturity; puerile.
Tired of your childish pranks.
American Heritage

Behaving immaturely.

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

Origin of Childish

  • child +‎ -ish

    From Wiktionary

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childish