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dullness
noun
1.
the quality of being slow to understand
obtuseness
Derived from:
dull
2.
the quality of lacking interestingness
leerness
Derived from:
dull
3.
a lack of visual brightness
Antonym:
brightness
Derived from:
dull
4.
lack of sensibility
Derived from:
dull
5.
without sharpness or clearness of edge or point
not-all-there
bluntness
Antonym:
sharpness
Derived from:
dull