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Adjective: fallacious  fu'ley-shus
  1. Containing or based on a fallacy
    "fallacious reasoning";
    - unsound
  2. Involving deception
    "fallacious testimony";
    - deceitful, fraudulent
  3. Based on an incorrect or misleading notion or information
    "fallacious hope"

See also: dishonest, dishonorable [US], dishonourable [Brit, Cdn], incorrect, invalid, wrong

Encyclopedia: Fallacious