adjective

(of a person or wrongful act, especially a crime) utterly odious or wicked.

a battery of heinous crimes

odious,wicked,evil,atrocious,monstrous,disgraceful,abominable,detestable,contemptible,reprehensible,despicable,horrible,horrific,horrifying,terrible,awful,abhorrent,loathsome,outrageous,shocking,shameful,hateful,hideous,unspeakable,unpardonable,unforgivable,inexcusable,execrable,ghastly,iniquitous,villainous,nefarious,beneath contempt,beyond the pale,egregious,flagitious