muddy vs dirty

muddy and dirty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
muddy	No	Yes	Yes	No
dirty	No	Yes	Yes	No

As adjectives, muddy and dirty are synonyms defined as:

muddy and dirty: (of color) discolored by impurities; not bright and clear

Other synonyms of muddy include dingy, muddied.

As verbs, dirty is a hypernym of muddy; that is, dirty is a word with a broader meaning than muddy:

Other hypernyms of muddy include begrime, bemire, colly, grime, soil.

muddy (adjective)	dirty (adjective)
dirty and messy; covered with mud or muck	soiled or likely to soil with dirt or grime
(of color) discolored by impurities; not bright and clear	(of behavior or especially language) characterized by obscenity or indecency
(of liquids) clouded as with sediment	spreading pollution or contamination; especially radioactive contamination
(of soil) soft and watery	unethical or dishonest
	expressing or revealing hostility or dislike
	obtained illegally or by improper means
	(of a manuscript) defaced with changes
	(of color) discolored by impurities; not bright and clear
	vile; despicable
	contaminated with infecting organisms
	unpleasantly stormy
	violating accepted standards or rules