fəˈlāshəs adjective
Etymology: Middle French fallacieux, from Latin fallaciosus, from fallacia + -osus -ous
1. : embodying or presenting a fallacy
the demand was plausible, but the more I thought upon it the more … fallacious … it seemed — A.D.White
some fallacious conclusions regarding drugs and crime — D.W.Maurer & V.H.Vogel
read him a second time in order that I might state … articulately the points at which I thought he became fallacious — O.W.Holmes †1935
2. : deceptive , misleading , delusive , disappointing
the fallacious hope that the propriety of going to bed may at any moment dawn upon the paternal mind — W.L.Alden
a region … where … the fallacious colocynth, the wild melon, scatters its globes of bitter gold — Norman Douglas
• fal·la·cious·ly adverb