downhearted

US /ˌdaʊnˈhɑːr.t̬ɪd/

UK /ˌdaʊnˈhɑːr.t̬ɪd/

chán nản

unhappy and having no hope, especially because of a disappointment or failure:

•

After hearing the news of the defeat, she told supporters not to be downhearted.