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 noun, medical : affecting babies or very young children