disillusionverb [ T ]
uk/ˌdɪs.ɪˈluː.ʒən/us/ˌdɪs.ɪˈluː.ʒən/to disappoint someone by telling them the unpleasant truth about something or someone that they had a good opinion of or respected:
I hate to/I'm sorry to disillusion you, but pregnancy is not always wonderful - I was sick every day for six months.
disillusionment
noun [ U ] uk/ˌdɪs.ɪˈluː.ʒən.mənt/us/ˌdɪs.ɪˈluː.ʒən.mənt/also disillusion
There is increasing disillusionment with the government.