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Adjective: libellous  lI-bu-lus
  1. (used of statements) harmful and often untrue; tending to discredit or malign
    "A libellous charge may be made indirectly as well as directly"; "Which of these contains the libellous material?";
    - calumniatory, calumnious, defamatory, denigrative, denigrating, denigratory, libelous [US], slanderous

See also: harmful

Encyclopedia: Libellous