dull vs arid

dull and arid both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dull	No	Yes	Yes	No
arid	No	Yes	No	No

dull (adjective)	arid (adjective)
not having a sharp edge or point	lacking sufficient water or rainfall
emitting or reflecting very little light	lacking vitality or spirit; lifeless
lacking in liveliness or animation
not keenly felt
darkened with overcast
(of business) not active or brisk
blunted in responsiveness or sensibility
being or made softer or less loud or clear
slow to learn or understand; lacking intellectual acuity
not clear and resonant; sounding as if striking with or against something relatively soft
(of color) very low in saturation; highly diluted
so lacking in interest as to cause mental weariness

dull (verb)	arid (verb)
become dull or lusterless in appearance; lose shine or brightness
make less lively or vigorous
become less interesting or attractive
make dull in appearance
make dull or blunt
deaden (a sound or noise), especially by wrapping
make numb or insensitive