1. Without sharpness or clearness of edge or point
   "the dullness of the pencil made his writing illegible";
   - bluntness
    
2. A lack of visual brightness
   "the brightness of the orange sky was reflected in the dullness of the orange sea"
    
3. The quality of lacking interestingness
   "the stories were of a dullness to bring a buffalo to its knees";
   - monotonousness
    
4. The quality of being slow to understand
   "The student's dullness in mathematics was a concern for his teachers";
   - obtuseness
    
5. 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"

See also: dull, hebetudinous [rare]

Type of: callosity, callousness, cold-bloodedness, configuration, conformation, contour, daftness [informal], feeblemindedness, form, hardness, insensibility, shape, stupidity, unfeelingness, uninterestingness, visual property

Antonym: brightness

Encyclopedia: Dullness