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
This suggests that the immune system may be involved in infantile amnesia.
—
Veronique Greenwood,
Time,
23 Feb. 2026
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
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
Veronique Greenwood,
Time,
23 Feb. 2026
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
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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Of course, this is no tragedy — there comes a time to put away childish things, 40-something video-gamers notwithstanding — but the movie comes close to regarding it as such.
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This one has a charming clover shape to make your space feel animated, but not childish.
Adjective
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His position is assumed, in turn, by the largest of the immature fish, who, thanks to the tragedy, finally gets to grow up.
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Even Stevens was never afraid to go all out for its constant string of gags and jokes, led by Shia LaBeouf as the immature prankster Louis Stevens.
Adjective
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Programming includes individual and family mental wellness counseling, lifestyle empowerment consultations, and adolescent nutritional consultations.
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At another section of the hospital, teens in hospital scrubs walked the quiet halls of the adolescent unit with their lunch trays.
Adjective
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In 2023, 18-year-old Bryan Diaz died of a fentanyl overdose at the county’s other main juvenile hall in Sylmar.
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Others questioned how the county is addressing juvenile crime, including carjackings involving young suspects.
Cite this Entry
“Infantile.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infantile. Accessed 2 Jul. 2026.
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