unholy in WordNet English dictionary

1. extremely evil or cruel; expressive of cruelty or befitting hell
   "something demonic in him--something that could be cruel"; "fires lit up a diabolic scene"; "diabolical sorcerers under the influence of devils"; "a fiendish despot"; "hellish torture"; "infernal instruments of war"; "satanic cruelty"; "unholy grimaces"
   demonic  diabolic  diabolical  fiendish  hellish  infernal  satanic  unholy 
   
2. having committed unrighteous acts
   "a sinful person"
   sinful  unholy  wicked 
   
3. not hallowed or consecrated
   unholy  unhallowed