Sophomoric Definition

sŏfə-môrĭk, -mŏr-
adjective
Of, like, or characteristic of sophomores.
Webster's New World
Exhibiting great immaturity and lack of judgment.
Sophomoric behavior.
American Heritage
Juvenile, pretentious, silly, etc.
Webster's New World

Conceited and overconfident of knowledge but poorly informed and immature.

Wiktionary
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