disillusion
dis-il-lu-sion
verb
To cause someone to realise that a belief or ideal is false or unrealistic.
"The harsh reality quickly disillusioned him."
noun
A feeling of disappointment from discovering something is not as good as believed.
"He felt a profound sense of disillusion."
Thesaurus
Synonyms: disenchantment, disillusionment, disenchant
Antonyms: delight, enchant, enrapture, enthral, enthrall, ravish, transport