Dimness is a related term of dullness.
As nouns the difference between dimness and dullness
is that dimness is the state of being dim, poorly illuminated, almost dark while dullness is the quality of being slow to understand things.
dimness
English
Noun
The state of being dim, poorly illuminated, almost dark.
Anagrams
*
dullness
English
Alternative forms
* dulness
Noun
(en-noun)
The quality of being slow to understand things.
The quality of being uninteresting.
The lack of visual brilliance.
(of an edge) bluntness.