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

Examples of infantile in a Sentence

the infantile humor that teenage boys are justly famous for
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
There is an infantile phase, a childhood phase, and an adult phase. Team Verywell Health, Verywell Health, 3 Apr. 2025 There are still rooms and contexts in which Germans — and now the head coach of the English national football team — are subject to infantile innuendo. Sebastian Stafford-Bloor, New York Times, 28 Mar. 2025 If nothing else is done with those mice, that association will apparently be forgotten later in life due to infantile amnesia. John Timmer, Ars Technica, 21 Mar. 2025 If this is correct, is there a connection between song and the most basic infantile communication? Aaron Shattuck, Scientific American, 18 Feb. 2025 See All Example Sentences for infantile

Word History

First Known Use

1696, in the meaning defined at sense 1

Time Traveler
The first known use of infantile was in 1696

Browse Nearby Words

Cite this Entry

“Infantile.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infantile. Accessed 7 Apr. 2025.

Kids Definition

infantile

adjective
in·​fan·​tile ˈin-fən-ˌtīl How to pronounce infantile (audio)
-tᵊl,
-ˌtēl
: of, relating to, or resembling infants or infancy
also : childish

Medical Definition

infantile

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

More from Merriam-Webster on infantile

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