downheartedness vs dejectedness

downheartedness and dejectedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
downheartedness	Yes	No	No	No
dejectedness	Yes	No	No	No

As nouns, downheartedness and dejectedness are synonyms defined as:

Other synonyms of downheartedness include dispiritedness, low-spiritedness, lowness.

downheartedness (noun)	dejectedness (noun)
a feeling of low spirits	a feeling of low spirits