downhearted vs gloomy

downhearted and gloomy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
downhearted	No	Yes	No	No
gloomy	No	Yes	No	No

As adjectives, downhearted and gloomy are synonyms defined as:

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

downhearted (adjective)	gloomy (adjective)
filled with melancholy and despondency	depressingly dark
	filled with melancholy and despondency
	causing dejection