Same word as nasty:

awful, beastly, bum, dirty, disagreeable, fierce, filthy, foul, gross, grubby, hellish, horrible, horrid, icky, impure, loathsome, lousy, malodorous, mephitic, murderous, nauseating, noisome, noxious, objectionable, obnoxious, obscene, odious, ornery, outrageous, poison, polluted, raunchy, repellent, repugnant, repulsive, revolting, rough, sickening, soiled, squalid, stinking, tough, unappetizing, unclean, uncleanly, ungodly, unholy, unpleasant, vile, vulgar, yucky