lack of interest or excitement
tasks of such repetitive and numbing dullness
a desert of unremitting flatness and dullness
the dullness of domestic life
lack of brightness, vividness, or sheen
flowery options to brighten up the dullness of autumn
the summer light cut into the dullness of the room
the dullness of the colours
the quality of being slow to understand; stupidity
critical comments on the stupidity or dullness of those in authority
dullness of comprehension