sophomoronic

Origin:
sophomoric + moronic = sophomoronic

Definition:
adj. of or pertaining to someone who is overconfident and immature, but also unintelligent.

Exemplum:
Rashad's black-tie bachelor party is certain to be influenced by the sophomoronic informality of a few overly intoxicated rakes.

Other forms:
sophomoron (n.)

Commentary:
It has been suggested that combining "sophomoric" and "moronic" is unnecessary because of the similarity between these terms. However, I contend that while the terms are easily related, they are not synonyms. Thus combining the two is not, in fact, redundant. Instead, I think their combination brings far more emphasis and nuance to a description than either term would on its own.

Credit:
Nate Winter