1) Calumniatory 2) Calumnious 3) Containing defamation 4) Denigrating 5) Denigrative 6) Denigratory 7) French word used in English 8) Harmful 9) Harmful and often untrue 10) Injurious to reputation 11) Libellous 12) Libelous 13) Slanderous 14) Unfounded 15) Vilifying 1) Calumniatory 2) Calumnious 3) Denigrating 4) Denigrative 5) Denigratory 6) Injurious 7) Insulting 8) Libellous 9) Libelous 10) Slanderous 
• (a.) Containing defamation; injurious to reputation; calumnious; slanderous; as, defamatory words; defamatory writings.
De·fam'a·to·ry adjective Containing defamation; injurious to reputation; calumnious; slanderous; as, defamatory words; defamatory writings. 
defamatory Harmful statements regarding someone’s good name, character, or reputation.
containing defamation; injurious to reputation; slanderous or libelous: She claimed that the article in the magazine was defamatory.