Calumniatory is an adjective that describes something or someone who makes false and damaging statements about someone else. Synonyms for calumniatory include defamatory, slanderous, libelous, vilifying, derogatory, disparaging, and traducing. Defamatory implies an injury to someone's reputation by the communication of a falsehood. Slanderous suggests an intent to harm by deep insult. Libelous emphasizes a written or published falsehood, while vilifying implies a character assassination of someone's reputation.