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infantile

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infantile/ˈɪnfənˌtajəl/adjective
infantile
/ˈɪnfənˌtajəl/
adjective
Learner's definition of INFANTILE  
[more infantile; most infantile]disapproving : annoying and childish: very silly in a way that is not appropriate or polite
always used before a nounmedical : affecting babies or very young children
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