Immaturerness 

a person who is silly or acts in a childish way

WELL I'LL JUST PACK UP MY BAND WAGON OF IMMATURERNESS AND HITCH UP A RIDE DOWN TO MEXICO!.

Immaturerness by pillow fan December 12, 2010

immatureness 

the act of being immature

Your actions are full of immatureness

immatureness by ron January 18, 2005

immatureness 

The act of being immature

the term became popular on the evening of 4/19/04

the term originates from one emily O.

that bitch was filled with immatureness

immatureness by Taylor April 19, 2004