WordNet sense 1 (extremely wicked):

nefarious, villainous

WordNet sense 2 (characterized by iniquity; wicked because it is believed to be a sin):

iniquitous, sinful, ungodly

WordNet sense 3 (having the nature of vice):

evil, vicious

WordNet sense 4 (naughtily or annoyingly playful):

impish, mischievous, puckish, pixilated, implike, prankish

WordNet sense 5 (full of fun and high spirits):

playful

WordNet sense 6 (having committed unrighteous acts):

unholy

WordNet sense 7 (not righteous):

unrighteous

WordNet sense 8 (highly offensive; arousing aversion or disgust):

disgusting, distasteful, foul, loathsome, repellent, revolting, yucky, disgustful, loathly, repellant, repelling, skanky

WordNet sense 9 (unpleasant or disgusting especially to the senses):

offensive

WordNet sense 10 (intensely or extremely bad or unpleasant in degree or quality):

severe, terrible

WordNet sense 11 (in an extreme degree):

intense