Etymology
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maligner (n.)

early 15c., malignour, "one who traduces or defames another," from Old French malignor, agent noun from malignier (see malign (v.)).

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Definitions of maligner

maligner (n.)
one who attacks the reputation of another by slander or libel;
Synonyms: defamer / slanderer / vilifier / libeler / backbiter / traducer
From wordnet.princeton.edu