dulness

noun

1. 1

   The quality of being slow of understanding things; stupidity.

2. 2

   The quality of being uninteresting; boring or irksome.

3. 3

   Lack of interest or excitement.

4. 4

   The lack of visual brilliance; want of sheen.

   “dullness of autumn”

5. 5

   (of an edge) bluntness.

6. 6

   The quality of not perceiving or kenning things distinctly.

   “dullness of sight, or of hearing”

7. 7

   Drowsiness.