Synonyms for Dirty:

adj.

all (adjective)
unclean, soiled.
bedraggled (adjective)
muddied, slovenly.
blemished (adjective)
spotted.
blue (adjective)
shady, indecent.
despicable (adjective)
shabby.
dishonest (adjective)
shady, shabby, cheating.
impure (adjective)
obscene, immoral, imperfect, slovenly, sordid, unclean, blemished, impure, defective.
obscene (adjective)
vulgar, indecent, obscene, naughty, filthy, scatologic, gross, pornographic.
obscene, pornographic (adjective)
ribald, indecent, off-color, contemptible, scatological, sordid, mean, lewd, unclean, blue, uncleanly, immoral, impure, salacious, coarse, vulgar.
rough (adjective)
roily, roiled.
slovenly (adjective)
sloppy, messy, neglectful, squalid, unkempt, slovenly, careless, shabby, disheveled.
soiled, unclean (adjective)
slimy, raunchy, unwashed, begrimed, slovenly, sloppy, untidy, contaminated, fouled, nasty, grungy, squalid, lousy, unsightly, unswept, murky, bedraggled, sooty, unhygienic, grimy, smutty, smudged, greasy, icky, filthy, disheveled, polluted, slatternly, unkempt, defiled, black, crummy, messy, spattered, unsanitary, mucky, dusty, spotted, grubby, scummy, straggly.
unclean (adjective)
smutty, offensive, slovenly, infectious, toxic, fetid, unsanitary, odious, septic, dusty, disgusting, mucky, unhygienic, scruffy, insalubrious, defiled, murky, sordid, squalid, unclean, grubby, filthy, obscene, untidy, impure, muddy, dingy, scatological, grimy, crummy, foul, grungy, unhygenic, sloppy, icky, shabby, putrid, festering.
vulgar (adjective)
broad, blue.

n.

illicit, shady, clandestine, improper, fraudulent, unauthorized, uncleanly, unlawful, unconstitutional, wrongful. thorough, utterly, excruciating, hopelessly, heavy, calm, rugged, tumultuous, utter, ugly, tempestuous, downright, roiled, unspeakable, violent, such as it is, rough, wild, raging, turbulent, sadly, roily. mess up. dirty (noun)
nasty, bemire, dirty-minded, marked-up, black, dust-covered, grime, filthy, mucky, blue, foul, snot-nosed, lewd, feculent, lousy, draggled, foul-spoken, smudged, unsporting, smirched, grungy, soil, hostile, colly, greasy, scummy, profane, ill-gotten, buggy, oily, travel-soiled, infected, scatological, begrimed, scabrous, snotty, grubby, travel-stained, muddied, unswept, foul-mouthed, septic, cheating, flyblown, muddy, salacious, unsportsmanlike, bawdy, begrime, raunchy, smutty, ribald, soiled, awful, unfair, fecal, stormy, spattered, smudgy, smeared, unjust, faecal, blasphemous, unclean, illegal, dusty, sordid, unwashed, obscene, grimy, dingy, bespattered, besplashed, illegible, corrupt, squalid, off-color, maculate, befouled, bedraggled, fouled, contaminated, splashed, contaminating.
nasty (noun)
ruthless, contemptible, disagreeable, mean.

v.

cause to be soiled (verb)
smirch, grime, smear, corrupt, stain, sully, pollute, muddy, taint, begrime, mess up, defile, foul, smudge, contaminate, tarnish.
contaminated (verb)
polluted.
dirty (verb)
smudge, foul, contaminate, defile, pollute, befoul, tarnish, streak, scrubby, smirch, putrefy, smear, sooty, soil, stain, muddy, besmirch, sully, taint.

Other synonyms:

ripe, uncleanly, abusive, scatologic, vitriolic, Fescennine. raging, turbulent, tempestuous, roiled, barnyard. mess up. rugged, coarse. violent, rough. wild. heavy. contaminate
befoul.
daub
begrimed, begrime.
indelicate
broad.
messy
slatternly.
sooty
smoky.
unpleasant
ugly.
Other relevant words:
nasty, filthy, coarse, smudgy, contemptible, begrime, scrubby, bawdy, ribald, grime, salacious, heavy, scummy, blue, lewd, sooty, mean, smoky.

Usage examples for dirty

  1. " My dirty work too," said the colonel. – Jack O' Judgment by Edgar Wallace
  2. You thought it dirty – The Real Latin Quarter by F. Berkeley Smith
  3. Yes, sir; and a precious dirty letter it was, too. – The Mystery of a Hansom Cab by Fergus Hume