DULLNESS
dullness, bluntness
(noun) without sharpness or clearness of edge or point; “the dullness of the pencil made his writing illegible”
dullness
(noun) lack of sensibility; “there was a dullness in his heart”; “without him the dullness of her life crept into her work no matter how she tried to compartmentalize it.”
dullness
(noun) a lack of visual brightness; “the brightness of the orange sky was reflected in the dullness of the orange sea”
dullness
(noun) the quality of lacking interestingness; “the stories were of a dullness to bring a buffalo to its knees”
dullness, obtuseness
(noun) the quality of being slow to understand
Source: WordNet® 3.1
Etymology
Noun
dullness (usually uncountable, plural dullnesses)
The quality of being slow of understanding things; stupidity.
The quality of being uninteresting; boring or irksome.
Lack of interest or excitement.
The lack of visual brilliance; want of sheen.
(of an edge) bluntness.
The quality of not perceiving or kenning things distinctly.
(archaic) Drowsiness.
Source: Wiktionary
Dull"ness, n.
Definition: The state of being dull; slowness; stupidity; heaviness;
drowsiness; bluntness; obtuseness; dimness; want of luster; want of
vividness, or of brightness. [Written also dulness.]
And gentle dullness ever loves a joke. Pope.
Source: Webster’s Unabridged Dictionary 1913 Edition