'dulness' definitions:

Definition of 'dulness'

From: GCIDE

Dullness \Dull"ness\, n. The state of being dull; slowness; stupidity; heaviness; drowsiness; bluntness; obtuseness; dimness; want of luster; want of vividness, or of brightness. [Written also dulness.] [1913 Webster]
And gentle dullness ever loves a joke. --Pope. [1913 Webster]