nouns
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"
is a type of (narrower)
inability to capture or hold one's interest
is an attribute of
lacking in liveliness or animation
"he was so dull at parties"; "a dull political campaign"; "a large dull impassive man"; "dull days with nothing to do"; "how dull and dreary the world is"; "fell back into one of her dull moods"
a lack of visual brightness
"the brightness of the orange sky was reflected in the dullness of the orange sea"
is a type of (narrower)
an attribute of vision
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."
is a type of (narrower)
devoid of passion or feeling; hardheartedness
without sharpness or clearness of edge or point
"the dullness of the pencil made his writing illegible"