in·​fan·​tile | \ ˈin-fən-ˌtī(-ə)l How to pronounce infantile (audio) , -tᵊl, -ˌtēl, -(ˌ)til \

Definition of infantile

1 : of or relating to infants or infancy
2 : suitable to or characteristic of an infant especially : very immature infantile humor

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Other Words from infantile

infantility \ ˌin-​fən-​ˈti-​lə-​tē How to pronounce infantility (audio) \ noun

Examples of infantile in a Sentence

the infantile humor that teenage boys are justly famous for
Recent Examples on the Web Western consumers, critics, and curators have tended to regard the paintings made during this period as amateurish, wacky, or grotesque attempts by infantile artists to reproduce the original VHS covers. Anakwa Dwamena, The New York Review of Books, "Ghana’s Handmade Movie Poster Boom," 18 Jan. 2020 While all of our experiences shape the brain, even the infant brain, in important ways, infantile amnesia is the scientific term for our inability as adults to recall memories from the early years of life. Cassie Shortsleeve, Condé Nast Traveler, "The Power of Traveling With an Infant—Even If They’ll Never Remember," 1 Jan. 2020 The infantile, effusive and maybe even slightly sinister Pee-wee Herman, a character created by comedian Paul Reubens, made Americans guffaw. oregonlive, "Paul Reubens is taking ‘Pee-wee’s Big Adventure’ on road for 35th anniversary, with first stop in Portland," 9 Dec. 2019 Not long after her arrival at memory care, Mom began a series of infantile clashes with the staff. Winston Ross, Longreads, "What Shattered My Mother’s Mind," 8 Dec. 2019 Some of the physical limitations that make Baby Yoda seem especially infantile, like his waddle of a walk, may not be developmental delays at all. Eric Spitznagel, Popular Mechanics, "An Alarmingly Deep Dive Into the Science of Baby Yoda," 2 Dec. 2019 Such stands would be unremarkable in a different time — say, one in which Republicans in Washington had consciences to outweigh their terror of an infantile president turning his increasingly radical base against them., "In praise of Pierre Delecto — er, Mitt Romney - The Boston Globe," 24 Oct. 2019 According to her mother's blog, Adelaide was diagnosed with epilepsy at seven months and later, infantile spasms, a severe form of childhood epilepsy. Lisa Respers France, CNN, "'Hamilton' star Miguel Cervantes mourns death of 3-year-old daughter," 14 Oct. 2019 Even though pediatricians see fewer infantile spasms cases, Nordli said to go to your pediatrician first. Christen A. Johnson,, "Infantile spasms can make it look as if your baby is just sleepy. After ‘Hamilton’ actor Miguel Cervantes’ daughter died, here’s what parents need to know," 14 Oct. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infantile.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of infantile

1696, in the meaning defined at sense 1

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Time Traveler for infantile

Time Traveler

The first known use of infantile was in 1696

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Statistics for infantile

Last Updated

3 Feb 2020

Cite this Entry

“Infantile.” Dictionary, Merriam-Webster, Accessed 18 Feb. 2020.

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More Definitions for infantile


How to pronounce infantile (audio)

English Language Learners Definition of infantile

disapproving : annoying and childish : very silly in a way that is not appropriate or polite
medical : affecting babies or very young children


in·​fan·​tile | \ ˈin-fən-ˌtīl How to pronounce infantile (audio) \

Kids Definition of infantile

: childish sense 2 infantile behavior


in·​fan·​tile | \ ˈin-fən-ˌtīl How to pronounce infantile (audio) , -tᵊl How to pronounce infantile (audio) , -ˌtēl How to pronounce infantile (audio) , -(ˌ)til How to pronounce infantile (audio) \

Medical Definition of infantile

1 : of, relating to, or occurring in infants or infancy infantile eczema
2 : suitable to or characteristic of an infant especially : very immature

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