lowbrow
Lowbrow (adj) means Simple and undemanding, made for ordinary tastes rather than for the educated or cultured.
Etymology
A bahuvrihi compound of low + brow. An Americanism whose first use appears c. 1902. Refers to the (by that time discredited) pseudoscience of phrenology, which suggested that a person of low intelligence and sophistication would possess a lower brow-line than someone of greater intelligence and sophistication.