dull
adjective
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(of business) not active or brisk“business is dull (or slow)”slow
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emitting or reflecting very little light“a dull glow”
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(of color) very low in saturation
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slow to learn or understandslow
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darkened with overcastleaden
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not having a sharp edge or point“the knife was too dull to be of any use”
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not keenly felt“a dull throbbing”
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lacking in liveliness or animation“They were so dull at parties.”
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so lacking in interest as to cause mental wearinessslow
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being or made softer or less loud or clear“the dull boom of distant breaking waves”muffled
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not clear and resonantthudding
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blunted in responsiveness or sensibility“a dull gaze”
verb
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make less lively or vigorous“Middle age dulled my appetite for travel.”
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become dull or lusterless in appearance
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become less interesting or attractivepall
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make dull in appearance“Age had dulled the surface”
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make dull or blunt“Too much cutting dulls the knife's edge”
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make numb or insensitivenumbbluntbenumb
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deaden (a sound or noise), especially by wrappingmutedampmuffledampentone down