Falsely accusing one, or making false statements such as to ruin the reputation of the person in question.
Slander, Character assassination, Defamation

It is a hobby of the media to spread calumny about celebrities.
by Hanasakurou May 1, 2016
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(of a statement) false and defamatory; slanderous.
Once Trump stepped down from a political platform, his calumnious speeches provoked baying applause from audiences, he was courteous and considerate even to foreign politicians he had just slandered in the speech
by erudite fuck June 14, 2020
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