Definition of dullness

The noun dullness has 5 senses? (no senses from tagged texts)

(the quality of being slow to understand)

(the quality of lacking interestingness; "the stories were of a dullness to bring a buffalo to its knees")

(a lack of visual brightness; "the brightness of the orange sky was reflected in the dullness of the orange sea")

(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.")

(without sharpness or clearness of edge or point; "the dullness of the pencil made his writing illegible")