I've been looking for a pair or words that mean that a person doesn't have all the details and doesn't realize that they do not, and its opposite counter part.
I was thinking the word "partialist" would cover the first thing, but this turned out to be a DSM-IV manual sexual disorder, despite it sounding right.
For example, "He was a partialist, he didn't know what he didn't know."
I thought that the opposite would be a "comprehensivalist" or someone who knows they have all the details.
Best Answer
The adjective "sophomoric" comes to mind to describe the first category. It means "conceited and overconfident of knowledge but poorly informed and immature."