fallaciousness

from WordNet (r) 3.0 (2006)

fallaciousness
    n 1: result of a fallacy or error in reasoning

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

fallaciousness \fallaciousness\ n.
   1. result of a fallacy or error in reasoning.
      [WordNet 1.5]