Definition of maligning:
(adj) :
Malevolent.
(adj) :
Evil or malignant in disposition, nature, intent or influence.
(v) :
(transitive) To make defamatory statements about; to slander or traduce.
(adj) :
(oncology) Malignant.
(v) :
(transitive, archaic) To treat with malice; to show hatred toward; to abuse; to wrong.