most vile

• despicableMorally worthless, beneath regard
• loathsomeArousing intense disgust
• abhorrentCausing intense revulsion
• wretchedExtremely unhappy or unfortunate
• repugnantExtremely distasteful or offensive

foul · disgusting · contemptible · revolting · heinous · odious · detestable · sickening · putrid · corrupt · depraved · monstrous · wicked · evil · scum · filth · abomination · rotten