Childish in a Sentence 

Definition of Childish  

exhibiting behavior typical of a child

Examples of Childish in a sentence

It would be Ok for Jack to act so childish, if only he weren’t thirty-seven years old.  
It is childish to complain about sharing, but even more so if you are an adult.  
Is there anything more childish than having a temper tantrum when you don’t get your way?  

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