Synonyms for Aspersion (same or very similar meaning)
WordNet sense 1 (a disparaging remark):
slurWordNet sense 2 (an abusive attack on a person's character or good name):
calumny, defamation, denigration, slanderWordNet sense 3 (the act of sprinkling water in baptism (rare)):
sprinklingFrom the ODE community, based on WordNetadd/edit