I used to think that the word immature strictly meant childlike behavior. Immaturity definitely does describe childlike behavior at times, but in the last few years, my impression has changed to think that perhaps people sometimes use the word immature to describe someone who is merely nonconformist or eccentric, as opposed to childlike. Of course, being childlike could be a form of nonconformity. However, in my opinion, people will call someone immature for being eccentric in a way that is not childlike. Or is all nonconformist behavior childlike? Does immature = nonconformist? Edit: I should have used a question mark in the title, making the title: Immature = nonconformist?