Innocence: refers to people's movements, demeanor, expressions, etc. It doesn't match their age. They are used positively for children and derogatory for adults. Childishness still exists: refers to the temperament or demeanor of an adult child still exists and is not yet mature. Naive: refers to young people who look like children, but also refers to talking like children. Describe a person who is immature, fights like a child and loves to play.