childish

adjective

child·​ish ˈchī(-ə)l-dish 

1

: of, relating to, or suitable for a child or childhood

She didn't like dolls, fairy tales were childish, and one couldn't draw all the time.

—Louisa May Alcott

… heard childish voices and laughter afar up the lane …

—Lucy Maud Montgomery

2

a

: marked by or suggestive of immaturity and lack of poise

a childish prank

behavior that was petty and childish

b

: lacking complexity : simple

It's a childish device, but it works.

c

: exhibiting a decline of cognitive abilities (such as memory) associated with old age

He did not like to lose his temper with his parents. … They were both getting childish and needed care and yet they resented any loss of authority.

—Pearl Buck

childishly adverb

behaving childishly

The concept is almost childishly simple.

—Business Week

childishness noun

… the childishness of the script overshadows a marvelous performance by Dolly Parton …

—People Weekly

Synonyms

• immature
• adolescent
• juvenile

Examples of childish in a Sentence

She has a childish face.

a letter written in childish scrawl

He opened the gifts with childish delight.

We're tired of their childish games.

I find his humor very childish.

Recent Examples on the Web

His comment about Shildt mad dogging him was childish and hilarious. —Dennis Lin, New York Times, 21 June 2025

But their tit for tat antics on social media have come across as particularly childish given their immense wealth and responsibilities. —Colin Pascal, Baltimore Sun, 9 June 2025

On Tires, Church plays Phil, Shane's rich but childish dad. —EW.com, 5 June 2025

There is something of the rat terrier in her small white face, an intensity that has never seemed childish but unnaturally adult. —Lizz Schumer, People.com, 17 June 2025

Word History

Etymology

see child

First Known Use

before the 12th century, in the meaning defined at sense 1

Kids Definition

childish

adjective

child·​ish ˈchīl-dish 

1

: of, resembling, or suitable to a child

childish laughter

2

: showing the less pleasing qualities (as silliness) often thought to be those of children

childishly adverb

childishness noun