dullness

adjective

1. mentally slow; stupid
2. lacking sensitivity; blunted in feeling or perception: dull to grief
3. physically slow; slow-moving; sluggish
4. lacking spirit, zest, etc.; not lively; listless, insipid, etc.
5. not active or busy; slack: a dull period for sales
6. causing boredom; tedious: a dull party
7. not pointed or sharp; blunt; not keen: a dull blade
8. not felt keenly; not acute: a dull headache
9. 1. not vivid; not brilliant; dim: a dull color
   2. not shiny or glossy; lusterless: a dull finish
10. not distinct, resonant, etc.; muffled: a dull thud
11. gloomy; cloudy: dull weather

transitive verb, intransitive verb