lowbrow

Short definition from Wiktionary

Adjective

1. 1
   Unsophisticated, not intended for an audience of intelligence, education or culture.

Noun

1. 1
   Someone or something of low education or culture.
2. 2
   An underground populist visual art movement that arose in the Los Angeles area in the late 1960s, inspired by comics, punk music, graffiti, etc.