Definition of “infantile” - English Dictionary

british dictionary

“infantile” in American English

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us /ˈɪn·fənˌtɑɪl/

of or relating to babies:

infantile diseases

If you describe the behavior of an older child or adult as infantile, you mean that it is foolish and is typical of a young child:

infantile humor

(Definition of “infantile” from the Cambridge Academic Content Dictionary © Cambridge University Press)