Source : Webster's Revised Unabridged Dictionary (1913)

Low-spirited \Low"-spir`it*ed\, a.
   Deficient in animation and courage; dejected; depressed; not
   sprightly. -- {Low"-spir`it*ed*ness}, n.

Source : WordNet®

low-spiritedness
     n : a feeling of lowness of spirits [syn: {downheartedness}, {dispiritedness}]