dull

darkened with overcast

“a dull sky”

not active or brisk

“business is dull (or slow)”

become dull or lusterless in appearance; lose shine or brightness

“the varnished table top dulled with time”

blunted in responsiveness or sensibility

“a dull gaze”

emitting or reflecting very little light

“a dull glow”

lacking in liveliness or animation

“he was so dull at parties”

make dull in appearance

“Age had dulled the surface”

make less lively or vigorous

“Middle age dulled her appetite for travel”

not having a sharp edge or point

“the knife was too dull to be of any use”

not keenly felt

“a dull throbbing”

very low in saturation; highly diluted

“dull greens and blues”

make numb or insensitive