dullness

noun

1. (uncountable, usually)The quality of being slow of understanding things.
2. (uncountable, usually)The quality of being uninteresting; boring; humorless or irksome.

   “If to raise malicious smiles at the infirmities or misfortunes of those who have never injured us be the province of wit or Humour, Heaven grant me a double Portion of Dullness—”

3. (uncountable, usually)Lack of interest or excitement.
4. (uncountable, usually)The lack of visual brilliance; want of sheen.

   “dullness of autumn”

5. (uncountable, usually)bluntness.
6. (uncountable, usually)The quality of not perceiving or kenning things distinctly.

   “dullness of sight, or of hearing”

7. (archaic, uncountable, usually)Drowsiness.

   “Prospero: […]Thou art inclin'd to sleep. 'Tis a good dulness, / And give it way— I know thou canst not choose.”