1. 
[syn: right, rightfulness]
The Collaborative International Dictionary of English v.0.48:
Rightfulness \Right"ful*ness\, n.
   1. The quality or state of being rightful; accordance with
      right and justice.
      [1913 Webster]
   2. Moral rectitude; righteousness. [Obs.] --Wyclif.
      [1913 Webster]
            We fail of perfect rightfulness.      --Sir P.
                                                  Sidney.
      [1913 Webster]
WordNet (r) 3.0 (2006):
rightfulness
    n 1: anything in accord with principles of justice; "he feels he
         is in the right"; "the rightfulness of his claim" [syn:
         right, rightfulness] [ant: wrong, wrongfulness]