Faintness is a related term of dullness.
As nouns the difference between faintness and dullness
is that faintness
is the property of being or feeling faint while dullness
is the quality of being slow to understand things.
The property of being or feeling faint.
The quality of being slow to understand things.
The quality of being uninteresting.
The lack of visual brilliance.
(of an edge) bluntness.