Infantile Definition
ĭnfən-tīl, -tĭl
adjective
Of or having to do with infants or infancy.
Webster's New World
Displaying or suggesting a lack of maturity; childish.
Infantile behavior; an infantile remark.
American Heritage
Like, suitable for, or characteristic of an infant; babyish; childish or childlike; immature.
Webster's New World
In the earliest stage of development.
Webster's New World
Origin of Infantile
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Middle English infantil from Latin īnfantīlis from īnfāns īnfant- infant infant
From American Heritage Dictionary of the English Language, 5th Edition
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