downheartedness

noun

A feeling or spell of dismally low spirits: blues, dejection, depression, despondence, despondency, doldrums, dolefulness, dumps, dysphoria, funk, gloom, glumness, heavy-heartedness, melancholy, mope (used in plural), mournfulness, sadness, unhappiness. See feelings, happy/unhappy.

The noun has one meaning:

Meaning #1: a feeling of lowness of spirits
  Synonyms: low-spiritedness, dispiritedness