dullness
noun
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without sharpness or clearness of edge or point“The dullness of the pencil made their writing illegible.”bluntness
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lack of sensibility“There was a dullness in my heart.”
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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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the quality of lacking interestingness“the stories were of a dullness to bring a buffalo to its knees”
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the quality of being slow to understandobtuseness