Source : Webster's Revised Unabridged Dictionary (1913)

Forthrightness \Forth"right`ness\, n.
   Straightforwardness; explicitness; directness. [Archaic]

         Dante's concise forthrightness of phrase. --Hawthorne.

Source : WordNet®

forthrightness
     n : the quality of being honest and straightforward in attitude
         and speech [syn: {candor}, {candour}, {candidness}, {frankness}]