The Collaborative International Dictionary of English v.0.48:

Dejected \De*ject"ed\, a.
   Cast down; afflicted; low-spirited; sad; as, a dejected look
   or countenance. -- De*ject"ed*ly, adv. --
   De*ject"ed*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dejectedness
    n 1: a feeling of low spirits; "he felt responsible for her
         lowness of spirits" [syn: downheartedness,
         dejectedness, low-spiritedness, lowness,
         dispiritedness]