Definify.com
Webster 1913 Edition
Justness
Just′ness
,Noun.
 The quality of being just; conformity to truth, propriety, accuracy, exactness, and the like; justice; reasonableness; fairness; equity; 
as, 
 justness 
of proportions; the justness 
of a description or representation; the justness 
of a cause.In value the satisfaction I had in seeing it represented with all the 
justness 
and gracefulness of action. Dryden.
Syn. – Accuracy; exactness; correctness; propriety; fitness; reasonableness; equity; uprightness; justice. 
Webster 1828 Edition
Justness
JUST'NESS
,Noun.
  1.
  Conformity to truth; as the justness of a description or representation.2.
  Justice; reasonableness; equity; as the justness of a cause or of a demand. [Justness is properly applied to things, and justice to persons; but the distinction is not always observed.]