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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Example Sentences
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Recent Examples of infantile
The incredibly painful, totally infantile, Banana Republic government shutdown ends.
—
Jim Cramer, CNBC, 10 Nov. 2025
The infantile form of Tay-Sachs manifests between three and six months of age, undermining gross motor control, worsening into seizures, deafness, and paralysis, and death by age five.
—New Atlas, 7 Nov. 2025
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
See All Example Sentences for infantile
Jim Cramer, CNBC, 10 Nov. 2025
The infantile form of Tay-Sachs manifests between three and six months of age, undermining gross motor control, worsening into seizures, deafness, and paralysis, and death by age five.
—New Atlas, 7 Nov. 2025
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
See All Example Sentences for infantile
Recent Examples of Synonyms for infantile
Adjective
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The more childish and unrefined, the better.—
Maddie Connors,
Los Angeles Times,
16 Mar. 2026
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Child actor Jax James has been set in the series regular role of Dougie, Maureen’s only son who is not even ten but acts like a 60-year-old scholar and has no time for childish fancies.—
Nellie Andreeva,
Deadline,
10 Mar. 2026
Adjective
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Preterm and low-birth-weight babies are at higher risk than full-term babies of developing NEC, potentially because of their immature digestive systems, according to the National Institutes of Health.—
Lisa Schencker,
Chicago Tribune,
10 Mar. 2026
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When the eggs hatch, the immature stages start feeding.—
Arricca Elin SanSone,
Southern Living,
3 Mar. 2026
Adjective
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The detrimental effects of early start times affect high school students during adolescent development.—
Letters to the Editor,
The Orlando Sentinel,
15 Mar. 2026
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My siblings and friends became an adolescent Image Ten, everyone contributing (poorly but enthusiastically) in front of and behind the camera.—
Literary Hub,
Literary Hub,
13 Mar. 2026
Adjective
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Roberge also had said the Tolland facility, which could have begun operating in 2029, would have housed as many as 18 teenage boys being held in state juvenile detention centers in Hartford and Bridgeport, which were not designed to house youths for long periods of time.—
Keith M. Phaneuf,
Hartford Courant,
14 Mar. 2026
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Two juvenile suspects exited the bus and fled the scene after the shooting.—
Garrett Behanna,
CBS News,
14 Mar. 2026
Cite this Entry
“Infantile.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infantile. Accessed 17 Mar. 2026.
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