Definition of "highbrow"

“He's so darn afraid you'll be offended if he smokes. You scare him. Every time he speaks of the weather you jump him because he ain't talking about poetry or Gertie—Goethe?—or some other highbrow junk. You've got him so leery he scarcely dares to come here.”

1920, Sinclair Lewis, chapter XIV, in Main Street: The Story of Carol Kennicott, New York, N.Y.: Harcourt, Brace and Howe