Search Result for "convincingness": 
Wordnet 3.0

NOUN (1)

1. the power of argument or evidence to cause belief; 



The Collaborative International Dictionary of English v.0.48:

Convincingness \Con*vin"cing*ness\, n.
   The power of convincing, or the quality of being convincing.
   [1913 Webster]


WordNet (r) 3.0 (2006):

convincingness
    n 1: the power of argument or evidence to cause belief