fallacious fallacious /fəˈleɪʃəs/

adjective

1. Based on an incorrect or misleading notion or information  ( fallacious )
   based on an incorrect or misleading notion or information
    Fallacious hope
   fallacious hope
   
2. Intended to deceive  ( deceitful , fallacious , fraudulent )
   intended to deceive
    Deceitful advertising
   deceitful advertising
    Fallacious testimony
   fallacious testimony
    Smooth, shining, and deceitful as thin ice
   smooth, shining, and deceitful as thin ice
    A fraudulent scheme to escape paying taxes
   a fraudulent scheme to escape paying taxes
   
3. Containing or based on a fallacy  ( fallacious , unsound )
   containing or based on a fallacy
    Fallacious reasoning
   fallacious reasoning
    An unsound argument
   an unsound argument