Thesaurus

Synonyms for Nasty include:

acerb, acerbic, acid, acrid, afflictive, ambitious, arduous, Augean, awful, awkward, baffling, bawdy, beastly, bedraggled, befouled, begrimed, bespattered, besplashed, bitter, black, blasphemous, blistering, blue, buggy, catchy, caustic, challenging, cobwebby, delicate, demanding, difficult, dingy, dirty, dirty-faced, dirty-minded, displeasing, dour, draggled, dreadful, dust-covered, dusty, effortful, embarrassing, faecal, fecal, feculent, filthy, flyblown, forbidding, foul, foul-mouthed, foul-spoken, fouled, fractious, god-awful, greasy, grim, grimy, grotty, grubby, grungy, hard, hard-fought, harsh, hateful, hellish, herculean, hot, ill-natured, impure, indecent, knotty, lewd, lousy, maculate, mean, mortifying, mucky, muddy, nasty, obscene, off-color, offensive, oily, painful, problematic, problematical, profane, ratty, raunchy, rebarbative, repellant, repellent, ribald, rocky, rough, rugged, salacious, scabrous, scatological, scummy, serious, sharp, sharp-worded, smudgy, smutty, snot-nosed, snotty, soiled, sooty, sordid, sore, spattered, splashed, squalid, sticky, sulfurous, sulphurous, tall, tart, thorny, ticklish, tight, touchy, tough, travel-soiled, travel-stained, tricky, troublesome, trying, unclean, uncleanly, unenviable, ungrateful, unhappy, unpalatable, unpleasant, unswept, untidy, unwashed, venomous, vexed, virulent, vitriolic

nasty is a ADJ.