as in childish
having or showing the annoying qualities (as silliness) associated with children
the infantile humor that teenage boys are justly famous for
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Recent Examples of infantile
But they’re born with severe brain malformations, eye abnormalities and a debilitating form of epilepsy called infantile spasms.
—
Erika Edwards, NBC news, 4 Oct. 2025
Muscle Man is a deeply ironic book, creating a vast chasm between Harold’s strongman self-image and his infantile powers of self-expression.
—Robert Rubsam, Vulture, 18 Sep. 2025
Additionally, some dogs, particularly breeds with extreme infantile traits (such as pugs and French bulldogs), may appear as helpless, harmless, and innocent as small children.
—Laura Baisas, Popular Science, 22 May 2025
The curious case of infantile amnesia The phenomenon of not remembering anything from early childhood is known as infantile amnesia.
—Aamir Khollam, Interesting Engineering, 21 Mar. 2025
See All Example Sentences for infantile
Erika Edwards, NBC news, 4 Oct. 2025
Muscle Man is a deeply ironic book, creating a vast chasm between Harold’s strongman self-image and his infantile powers of self-expression.
—Robert Rubsam, Vulture, 18 Sep. 2025
Additionally, some dogs, particularly breeds with extreme infantile traits (such as pugs and French bulldogs), may appear as helpless, harmless, and innocent as small children.
—Laura Baisas, Popular Science, 22 May 2025
The curious case of infantile amnesia The phenomenon of not remembering anything from early childhood is known as infantile amnesia.
—Aamir Khollam, Interesting Engineering, 21 Mar. 2025
See All Example Sentences for infantile
Recent Examples of Synonyms for infantile
Adjective
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This sort of behavior is childish and unsophisticated.—
Josh Brown,Sean Russo,
CNBC,
29 Jan. 2026
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These people are so childish and petty.—
U T Readers,
San Diego Union-Tribune,
28 Jan. 2026
Adjective
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The film’s vintage patina doesn’t detract from rising actor Will Price’s confident performance as an immature mobster who prefers bitcoin to stacks of Benjamins.—
Amy Nicholson,
Los Angeles Times,
30 Jan. 2026
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Unlike older drugs, this formula safely accounts for a baby’s immature metabolism.—
Kwesi Akonu Adom Mensah Forson,
The Conversation,
26 Jan. 2026
Adjective
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With a biting script by Tina Fey, the film fearlessly explores the dark side of the early aughts adolescent social scene.—
Kevin Jacobsen,
Entertainment Weekly,
7 Feb. 2026
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The teen recently spent a day at a major tech company that is working to shape the future of adolescent technology.—
Maggie Menderski,
Louisville Courier Journal,
6 Feb. 2026
Adjective
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These victories include an insulin co-pay cap, new money for public schools, lowering the cost of health care and child care, opening up mental health programs, connecting young adults to job opportunities, and reforming our juvenile justice system.—
Eleanor Dearman,
Fort Worth Star-Telegram,
14 Feb. 2026
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For the new study, Yun and her colleagues removed the thymus from several juvenile axolotls.—
Taylor Mitchell Brown,
Scientific American,
14 Feb. 2026
Cite this Entry
“Infantile.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infantile. Accessed 15 Feb. 2026.
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