Synonyms for validness:
noun verisimilitude
noun effectiveness
noun believableness
noun believability
noun believability
noun persuasiveness
noun mental power, energy
noun authenticity
noun goal, aim
noun energy, vigor
noun genuineness, lawfulness
Examples of uses:
It becomes essential, therefore, to examine the validness of this justification.
source
Title: Three Prize Essays on American Slavery, author: R. B. Thurston, url: http://www.gutenberg.org/files/32422/32422-h/32422-h.htm
