The word sophomoric, an adjective dating from 1813, is used to refer to and describe something or someone that is conceited, overconfident, poorly informed and immature, as characterized by a stereotypical high school sophomore. The phrase can be derisive, but is also used to refer to a style or vein of comedic act.
Phenotype: An appearance or characteristic of an individual, which results from the interaction of the person's genetic makeup and his or her environment. By contrast, the genotype is merely the genetic constitution (genome) of an individual.
In social psychology, a stereotype is a thought that can be adopted about specific types of individuals or certain ways of doing things. These thoughts or beliefs may or may not accurately reflect reality. However, this is only a fundamental psychological definition of a stereotype.