Definition of "Dull" :

verb: make less lively or vigorous

"Middle age dulled her appetite for travel."

verb: become dull or lusterless in appearance; lose shine or brightness

"The varnished table top dulled with time."

verb: become less interesting or attractive

verb: make dull in appearance

"Age had dulled the surface."

verb: make dull or blunt

"Too much cutting dulls the knife's edge."

verb: make numb or insensitive

verb: deaden (a sound or noise), especially by wrapping

adjective: (of business) not active or brisk

"Business is dull (or slow)."

adjective: emitting or reflecting very little light

"A dull glow."

adjective: (of color) very low in saturation; highly diluted

"Dull greens and blues."

adjective: slow to learn or understand; lacking intellectual acuity

"Although dull at classical learning, at mathematics he was uncommonly quick."

adjective: darkened with overcast

"A dull sky."

adjective: not having a sharp edge or point

"The knife was too dull to be of any use."

adjective: not keenly felt

"A dull throbbing."

adjective: lacking in liveliness or animation

"He was so dull at parties."

adjective: so lacking in interest as to cause mental weariness

"A dull play."

adjective: being or made softer or less loud or clear

"The dull boom of distant breaking waves."

adjective: not clear and resonant; sounding as if striking with or against something relatively soft

"The dull thud."

adjective: blunted in responsiveness or sensibility

"A dull gaze."