calumnious

adjective

ca·​lum·​ni·​ous kə-ˈləm-nē-əs 

: given to calumny

calumnious backbiting rivals

: constituting or marked by calumny

hurt by calumnious reports

: slanderous

Word History

Etymology

Middle French or Late Latin; Middle French calomnieux, from Late Latin calumniosus full of trickery, from Latin calumnia trickery, calumny + -osus -ous

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