WordNet sense 1 (contaminated with infecting organisms):

contaminated, pestiferous

WordNet sense 2 (containing or resulting from disease-causing organisms):

infected, septic

WordNet sense 3 ((of color) discolored by impurities; not bright and clear):

muddied

WordNet sense 4 (combined with extraneous elements):

impure

WordNet sense 5 (offensive or even (of persons) malicious):

awful, nasty

WordNet sense 6 (make soiled, filthy, or dirty):

begrime, bemire, grime, soil, colly

WordNet sense 7 ((of a manuscript) defaced with changes):

marked-up

WordNet sense 8 (obtained illegally or by improper means):

ill-gotten

WordNet sense 9 (prohibited by law or by official or accepted rules):

illegal

WordNet sense 10 (characterized by enmity or ill will):

hostile

WordNet sense 11 (violating accepted standards or rules):

unsportsmanlike, cheating, unsporting

WordNet sense 12 (not fair; marked by injustice or partiality or deception):

unfair, unjust

WordNet sense 13 (lacking in integrity):

corrupt

WordNet sense 14 (spreading pollution or contamination; especially radioactive contamination):

contaminating

WordNet sense 15 (suggestive of or tending to moral looseness):

lewd, obscene, raunchy, salacious

WordNet sense 16 (characterized by obscenity):

filthy, foul, smutty

WordNet sense 17 (characterized by profanity or cursing):

blue

WordNet sense 18 (not cleaned with or as if with soap and water):

unwashed

WordNet sense 19 (habitually unclean):

uncleanly

WordNet sense 20 (dirty and messy; covered with mud or muck):

mucky, muddy

WordNet sense 21 (infested with lice):

lousy

WordNet sense 22 (foul and run-down and repulsive):

flyblown, sordid, squalid

WordNet sense 23 (soiled with dirt or soot):

black

WordNet sense 24 (thickly covered with ingrained dirt or soot):

dingy, grimy, grubby, grungy, begrimed, dingy

WordNet sense 25 (made dirty or foul):

fouled

WordNet sense 26 (soiled or likely to soil with dirt or grime):

unclean, soiled

WordNet sense 27 ((especially of weather) affected or characterized by storms or commotion):

stormy