WordNet sense 1 (contaminated with infecting organisms):

contaminated, dirty

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

infected, septic

WordNet sense 3 (likely to spread and cause an epidemic disease):

pestilent, pestilential, plaguey

WordNet sense 4 ((especially of medicine) of disease or anything resembling a disease; attacking or affecting many individuals in a community or a population simultaneously):

epidemic

WordNet sense 5 (tending to corrupt or pervert):

corruptive, perversive

WordNet sense 6 (morally bad or wrong):

evil

WordNet sense 7 (causing irritation or annoyance):

annoying, bothersome, galling, irritating, nettlesome, pesky, vexatious, pestering, plaguy, teasing, vexing

WordNet sense 8 (not to your liking):

disagreeable