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the quality of being slow to understand
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the quality of lacking interestingness;
"the stories were of a dullness to bring a buffalo to its knees"
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a lack of visual brightness;
"the brightness of the orange sky was reflected in the dullness of the orange sea"
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lack of sensibility;
"there was a dullness in his heart"
"without him the dullness of her life crept into her work no matter how she tried to compartmentalize it."
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without sharpness or clearness of edge or point;
"the dullness of the pencil made his writing illegible"