/ ˈɪnfəntaɪl; NAmE / adjective
1.
( disapproving ) typical of a small child (and therefore not suitable for adults or older children)
SYN childish
2.
[ only before noun ] ( formal or technical ) connected with babies or very young children
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WORD ORIGIN
late Middle English : from French , or from Latin infantilis , from infans , infant- unable to speak, from in- not + fant- speaking (from the verb fari ).