Synonyms for Denigrating (same or very similar meaning)
WordNet sense 1 ((used of statements) harmful and often untrue; tending to discredit or malign):
calumnious, defamatory, libellous, libelous, slanderous, calumniatory, denigrative, denigratoryWordNet sense 2 (causing or capable of causing harm):
harmfulFrom the ODE community, based on WordNetadd/edit