fallacious in WordNet English dictionary

1. intended to deceive
   "deceitful advertising"; "fallacious testimony"; "smooth, shining, and deceitful as thin ice" - S.T.Coleridge; "a fraudulent scheme to escape paying taxes"
   deceitful  fallacious  fraudulent 
   
2. based on an incorrect or misleading notion or information
   "fallacious hope"
   fallacious 
   
3. containing or based on a fallacy
   "fallacious reasoning"; "an unsound argument"
   fallacious  unsound