demoralizing

Things that discourage you, or make you lose confidence, are demoralizing. It can be demoralizing to study hard for a test and do badly on it.

When you are rejected — getting turned down for a job or a date or a scholarship — it's demoralizing. If people whose opinions you value put you down or belittle you, that's demoralizing too. A more old-fashioned meaning of the word is "corrupting someone's morals," from the French démoraliser, which is thought to have been coined during the French Revolution.

Definitions of demoralizing
1

adj destructive of morale and self-reliance

Synonyms:
demoralising, disheartening, dispiriting
discouraging
depriving of confidence or hope or enthusiasm and hence often deterring action