disillusion
Concise Oxford English Dictionary © 2008 Oxford University Press:
disillusion /ˌdɪsɪˈl(j)uːʒ(ə)n/
▶noun the disappointing loss of a belief or an ideal. ▶verb cause to experience disillusion.
– derivatives
disillusioned adjective,
disillusionment noun.
disillusioned adjective,
disillusionment noun.
'disillusion' also found in these Oxford entries:

