Synonyms of 'disillusion'
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If you disabuse someone of something, you tell them or persuade them that what they believe is in fact untrue.
I did not disabuse them of this notion
They expressed their disappointment at what had happened.
Thesaurus for disillusion from the Collins English Thesaurus
If a person or thing disillusions you, they make you realize that something is not as good as you thought.