Dull

make dull in appearance

become dull or lusterless in appearance

deaden (a sound or noise), especially by wrapping

make numb or insensitive

make dull or blunt

become less interesting or attractive

make less lively or vigorous

lacking in liveliness or animation

emitting or reflecting very little light

being or made softer or less loud or clear

so lacking in interest as to cause mental weariness

(of color) very low in saturation

not keenly felt

slow to learn or understand

(of business) not active or brisk

not having a sharp edge or point

blunted in responsiveness or sensibility

not clear and resonant

darkened with overcast