disillusion
definition
the loss of naive beliefs or ideals
example
Her disillusion with politics grew after witnessing the corruption within the system.
synonyms
disenchantmentdisappointmentletdown
word origin — The word 'disillusion' comes from the prefix 'dis-' meaning 'removal or reversal' and 'illusion' from the Latin 'illūsiō' meaning 'deception, misleading.'