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 infantile (audio) \ noun

Synonyms & Antonyms for infantile



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Examples of infantile in a Sentence

the infantile humor that teenage boys are justly famous for
Recent Examples on the Web In the process, Norvell took a backhanded shot at Swinney’s infantile implication that FSU was somehow scared to play Clemson. Mike Bianchi,, "Clemson coach Dabo Swinney makes a fool of himself by accusing FSU of being COVID cowards | Commentary," 12 Sep. 2020 All the looting, assaults, verbal outrages, physical injuries and infantile behavior, as well as some city councils' simplistic notion of defunding their police departments, achieve nothing toward meaningful change. Mike Masterson, Arkansas Online, "MASTERSON ONLINE: Why not discussion?," 19 Sep. 2020 At issue is the amount of money the company owes CMS for its controversial Acthar Gel treatment, which is used primarily to treat infantile spasms and has been a poster child for the high cost of medicines. Ed Silverman, STAT, "Mallinckrodt loses a court case and is told to pay $650 million in overdue Medicaid rebates," 16 Mar. 2020 Toilet paper has primal—even infantile—associations, connected with what is arguably the body’s least agreeable function in a way we’ve been taught from toddlerhood. Jeffrey Kluger, Time, "In the Wake of the Coronavirus, Here's Why Americans Are Hoarding Toilet Paper," 14 Mar. 2020 The drug, however, is used primarily to treat infantile spasms. Ed Silverman, STAT, "Justice Department sues Mallinckrodt over ‘hundreds of millions of dollars’ in Medicaid rebates," 3 Mar. 2020 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

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

Cite this Entry

“Infantile.” Dictionary, Merriam-Webster, Accessed 7 Mar. 2021.

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More Definitions for infantile



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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