This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The quality of being slow to understand things.

n. The quality of being uninteresting.

n. The lack of visual brilliance.

n. bluntness.

n. The state of being dull; slowness; stupidity; heaviness; drowsiness; bluntness; obtuseness; dimness; want of luster; want of vividness, or of brightness.

n. The state or quality of being dull, in any sense of that word.

n. Synonyms Baldness, Heaviness, etc. (in style). See frigidity.

n. lack of sensibility

n. without sharpness or clearness of edge or point

n. a lack of visual brightness

n. the quality of being slow to understand

n. the quality of lacking interestingness

"And that the dullness of death is gay, compared to thy dullness—"

callousness    callosity    insensibility    unfeelingness    hardness   

cardiac dullness   

dulness   

slowness    stupidity    heaviness    drowsiness    bluntness    obtuseness    dimness    cheerlessness    darkness    depression   

dull   

dulness    apathy    boredom    torpor    laziness    languor    weariness    heaviness    lethargy    inactivity