1.Definition: a lack of visual brightness

"The brightness of the orange sky was reflected in the dullness of the orange sea"

Category: General

2.Definition: 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."

Category: General

3.Definition: the quality of being slow to understand

Related Noun(s):obtuseness

Category: General

4.Definition: the quality of lacking interestingness

"The stories were of a dullness to bring a buffalo to its knees"

Category: General

5.Definition: without sharpness or clearness of edge or point

"The dullness of the pencil made his writing illegible"

Related Noun(s):bluntness

Category: General