subliterature
noun
sub·lit·er·a·ture ˌsəb-ˈli-tə-rə-ˌchu̇r 
-ˈli-trə-ˌchu̇r,
-ˈli-tər-ˌchu̇r,
-ˈli-tə-ˌchu̇r,
-chər,
-ˌtyu̇r,
-ˌtu̇r
: popular writing (such as mystery or adventure stories) considered inferior to standard literature
Word History
First Known Use
1906, in the meaning defined above