Disillusionment
/dˌɪsɪˈluʒənmənt/
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Definition
(noun) A feeling of disappointment, akin to depression, arising from the realization that something is not what it was expected or believed to be, possibly accompanied by philosophical angst from having one's beliefs challenged.
Sentence Examples
Once you start dating the sleazy old professor, disillusionment sets in.
Tom's disillusionment was obvious.
CEFR Practice Quiz
Once you start dating the sleazy old professor, ____ sets in.