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Adjective: libelous  lI-bu-lus
Usage: US (elsewhere: libellous)
  1. (used of statements) harmful and often untrue; tending to discredit or malign
    "Which of these contains the libelous material?";
    - calumniatory, calumnious, defamatory, denigrative, denigrating, denigratory, libellous, slanderous

See also: harmful

Encyclopedia: Libelous