dis‧heart‧ened /dɪsˈhɑːtnd $ -ɑːrtnd/ adjective formal
[Word Family: adjective: heartened ≠ disheartened, heartening ≠ disheartening, heartless, hearty; noun: heart, heartlessness, heartiness; adverb: heartily, heartlessly, hearteningly ≠ dishearteningly; verb: hearten ≠ dishearten]
disappointed, so that you lose hope and the determination to continue doing something:
If young children don’t see quick results they grow disheartened.
—dishearten verb [transitive]

[TahlilGaran] Dictionary of Contemporary English ▲