Search Result for "invalidness": 
Wordnet 3.0

NOUN (1)

1. illogicality as a consequence of having a conclusion that does not follow from the premisses;
[syn: invalidity, invalidness]



The Collaborative International Dictionary of English v.0.48:

Invalidness \In*val"id*ness\, n.
   Invalidity; as, the invalidness of reasoning.
   [1913 Webster]


WordNet (r) 3.0 (2006):

invalidness
    n 1: illogicality as a consequence of having a conclusion that
         does not follow from the premisses [syn: invalidity,
         invalidness]