Source : Webster's Revised Unabridged Dictionary (1913)

Sorrowful \Sor"row*ful\, a. [OE. sorweful, AS. sorgful.]
   1. Full of sorrow; exhibiting sorrow; sad; dejected;
      distressed. ``This sorrowful prisoner.'' --Chaucer.

            My soul is exceeding sorrowful, even unto death.
                                                  --Matt. xxvi.
                                                  38.

   2. Producing sorrow; exciting grief; mournful; lamentable;
      grievous; as, a sorrowful accident.

   Syn: Sad; mournful; dismal; disconsolate; drear; dreary;
        grievous; lamentable; doleful; distressing. --
        {Sor"row*ful*ly}, adv. -- {Sor"row*ful*ness}, n.

Source : WordNet®

sorrowfulness
     n 1: the state of being sad; "she tired of his perpetual sadness"
          [syn: {sadness}, {sorrow}]
     2: a state of gloomy sorrow [syn: {mournfulness}, {ruthfulness}]