Source : Webster's Revised Unabridged Dictionary (1913)

Awfulness \Aw"ful*ness\, n.
   1. The quality of striking with awe, or with reverence;
      dreadfulness; solemnity; as, the awfulness of this sacred
      place.

            The awfulness of grandeur.            --Johnson.

   2. The state of being struck with awe; a spirit of solemnity;
      profound reverence. [Obs.]

            Producing in us reverence and awfulness. --Jer.
                                                  Taylor.

Source : WordNet®

awfulness
     n : a quality of extreme unpleasantness [syn: {dreadfulness}, {horridness},
          {terribleness}]