Dictionary definition · dull
verb
- make dull in appearance"Age had dulled the surface"
- become dull or lusterless in appearance; lose shine or brightness"the varnished table top dulled with time"
- deaden (a sound or noise), especially by wrapping
- make numb or insensitive"The shock numbed her senses"
- make dull or blunt"Too much cutting dulls the knife's edge"
- become less interesting or attractive
adjective
- lacking in liveliness or animation"he was so dull at parties"
- emitting or reflecting very little light"a dull glow"
- being or made softer or less loud or clear"the dull boom of distant breaking waves"
- so lacking in interest as to cause mental weariness"a boring evening with uninteresting people"
- (of color) very low in saturation; highly diluted"dull greens and blues"
- not keenly felt"a dull throbbing"
Source: Open English WordNet (CC BY 4.0).