ROGET THESAURUS
Calumniate
Detraction
VB
detract, derogate, decry, deprecate, depreciate, disparage, run down, cry down, backcap, belittle, sneer at, criticize, pull to pieces, pick a hole in one's coat, asperse, cast aspersions, blow upon, bespatter, blacken, vilify, vilipend, avile, give a dog a bad name, brand, malign, muckrake, backbite, libel, lampoon, traduce, slander, defame, calumniate, bear false witness against, speak ill of behind one's back, fling dirt, anathematize, dip the pen in gall, view in a bad light, impugn (disparage the motives of), assail, attack, oppose, denounce, accuse.