Definition of babyish adjective from the Oxford Advanced Learner's Dictionary

 

babyish

 adjective
adjective
BrE BrE//ˈbeɪbiɪʃ//
 
; NAmE NAmE//ˈbeɪbiɪʃ//
 
(usually disapproving)
 
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typical of or suitable for a baby Now she’s nine, she thinks toys are babyish and wants a computer.
See the Oxford Advanced American Dictionary entry: babyish