Etymology
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infantile (adj.)

mid-15c., "pertaining to infants," from Late Latin infantilis "pertaining to an infant," from infans "young child" (see infant). Sense of "infant-like" is from 1772.

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Definitions of infantile

infantile (adj.)
indicating a lack of maturity;
infantile behavior
Synonyms: childish
infantile (adj.)
of or relating to infants or infancy;
infantile paralysis
infantile (adj.)
being or befitting or characteristic of an infant;
infantile games
From wordnet.princeton.edu