Fallacious

Fal*la"cious (?), a. [L. fallaciosus, fr. fallacia: cf. F. fallacieux. See Fallacy.] Embodying or pertaining to a fallacy; illogical; fitted to deceive; misleading; delusive; as, fallacious arguments or reasoning. -- Fal*la"cious*ly, adv. - Fal*la"cious*ness, n.