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Definition of dull
dull - adj. (of business) not active or brisk; emitting or reflecting very little light; (of color) very low in saturation; highly diluted; darkened with overcast; not having a sharp edge or point; not keenly felt; lacking in liveliness or animation; being or made softer or less loud or clear; not clear and resonant; sounding as if striking with or against something relatively soft; blunted in responsiveness or sensibility; slow to learn or understand; lacking intellectual acuity; so lacking in interest as to cause mental weariness; verb make less lively or vigorous; become dull or lusterless in appearance; lose shine or brightness; make dull in appearance; make dull or blunt; become less interesting or attractive; make numb or insensitive; deaden (a sound or noise), especially by wrapping.
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