dishearten
The result was disheartening for him.
The disheartening fact is that people don't care about this issue very much.
She had had a disheartening day.
It's very disheartening that politics has been reduced to these tribal divisions.

SMART Vocabulary: related words and phrases

Disappointing yourself and others
abjectly
anticlimactic
anticlimax
be cracked up to be somethingidiom
be one in the eye for someoneidiom
blow
break
bubble
disappointingly
disappointment
disenchantment
dishearten
dishearteningly
fail
let the side downidiom
letdown
non-event
not all it's cracked up to beidiom
pity
sick

You can also find related words, phrases, and synonyms in the topics:

Discouraging and putting off

disheartening | American Dictionary

disheartening
adjective
us/dɪsˈhɑr·tən·ɪŋ/
causing a person to lose confidence, hope, and energy; discouraging:
The new injury, after he had come back from the last, was disheartening.