low-spirited vs downhearted

low-spirited and downhearted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
low-spirited	No	Yes	No	No
downhearted	No	Yes	No	No

As adjectives, low-spirited and downhearted are synonyms defined as:

Other synonyms of low-spirited include blue, depressed, dispirited, down, down in the mouth, downcast, gloomy, grim, low.

low-spirited (adjective)	downhearted (adjective)
filled with melancholy and despondency	filled with melancholy and despondency