adj. Neither highbrow or lowbrow, but somewhere in between.
n. A person or thing that is neither a highbrow or lowbrow, but in between.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who is neither a highbrow nor a lowbrow
Word Usage
"(By the term middlebrow, one seeks to describe a writer who, while disdaining the shoddy and the ephemeral, has built up a following among intelligent readers whose notions he takes care not to challenge or disturb.)"