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The definition of nasty

Synonyms:	annoying, obnoxious, malice, malodorous, ribald, spite, venom, unpleasantness, mean, bitchy (slang), offensive, spiteful, obscenity, porn (informal), pornography, indecency, licentious, ribaldry, unpleasant, ugly, disagreeable, vicious, abusive, vile, malicious, bad-tempered, despicable, disgust, dirty, foul, horrible, pollute, filthy, sickening, distasteful, repellent, objectionable, nauseate, odious, repugnant, loathsome, grotty (slang), noisome, yucko (Austral. slang), serious, bad, dangerous, critical, severe, painful, obscene, blue, gross, indecent, lewd, impure, lascivious
Antonyms:	pleasant, clean

From Collins