Immaturity refers to the state of not being fully grown up or not behaving in a responsible or mature manner. It is often associated with childishness and lacking the ability to handle situations maturely. Full definition
Car sickness or motion sickness is super common amongst puppies, and may be associated with immaturity of the inner ear apparatus that regulates equilibrium and balance. (americanshihtzuclub.org)
Even when he was not injured, you could see the traves of immaturity in the way he plays. (justarsenal.com)
For 30 - 45 year olds, No Jerks on the Job is for supervisors and managers dealing with immaturity in the workplace. (stephaniebarko.com)