dull vs slow

dull and slow both are adjectives.

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

As adjectives, dull and slow are synonyms defined as:

Other synonyms of dull include sluggish.

As adjectives, dull and slow are synonyms defined as:

Other synonyms of dull include dense, dim, dumb, obtuse.

As adjectives, dull and slow are synonyms defined as:

Other synonyms of dull include boring, deadening, ho-hum, irksome, tedious, tiresome, wearisome.

dull (adjective)	slow (adjective)
not having a sharp edge or point	not moving quickly; taking a comparatively long time
emitting or reflecting very little light	at a slow tempo
lacking in liveliness or animation	(used of timepieces) indicating a time earlier than the correct time
not keenly felt	(of business) not active or brisk
darkened with overcast	slow to learn or understand; lacking intellectual acuity
(of business) not active or brisk	so lacking in interest as to cause mental weariness
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)	slow (verb)
become dull or lusterless in appearance; lose shine or brightness	lose velocity; move more slowly
make less lively or vigorous	become slow or slower
become less interesting or attractive	cause to proceed more slowly
make dull in appearance
make dull or blunt
deaden (a sound or noise), especially by wrapping
make numb or insensitive

dull (adverb)	slow (adverb)
	without speed (`slow' is sometimes used informally for `slowly')
	showing a time that is earlier than the actual time