abominable, detestable, execrable, odious -- (unequivocally detestable; "abominable treatment of prisoners"; "detestable vices"; "execrable crimes"; "consequences odious to those you govern"- Edmund Burke)
atrocious, abominable, awful, dreadful, painful, terrible, unspeakable -- (exceptionally bad or displeasing; "atrocious taste"; "abominable workmanship"; "an awful voice"; "dreadful manners"; "a painful performance"; "terrible handwriting"; "an unspeakable odor came sweeping into the room")