disillusioned
US /ˌdɪs.ɪˈluː.ʒənd/
UK /ˌdɪs.ɪˈluː.ʒənd/

1.
désabusé, désenchanté
disappointed in someone or something that one discovers to be less good than one had believed
:
•
She became disillusioned with politics after the scandal.
Elle est devenue désabusée par la politique après le scandale.
•
Many young people feel disillusioned with the current economic system.
Beaucoup de jeunes se sentent désabusés par le système économique actuel.