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immature 
1  adj Something or someone that is immature is not yet completely grown or fully developed. 
She is emotionally immature.  
 immaturity  n-uncount 
In spite of some immaturity in the figure drawing and painting, it showed real imagination.  
2  adj If you describe someone as immature, you are being critical of them because they do not behave in a sensible or responsible way., (disapproval)  She's just being childish and immature.  
 immaturity  n-uncount 
...his immaturity and lack of social skills.