dullness >> ˈdʌlnəs
Definition: [noun] lack of interest or excitement.
Example: tasks of such repetitive and numbing dullness
Definition: [noun] lack of brightness, vividness, or sheen.
Example: flowery options to brighten up the dullness of autumn
Definition: [noun] the quality of being slow to understand; stupidity.
Example: critical comments on the stupidity or dullness of those in authority