1. causing someone to lose faith, trust, or optimistic beliefs about something or someone

1. present participle of disillusion; causing someone to realize that something is not as good or true as they believed

Examples

• The disillusioning truth about the scandal shocked the entire nation.
• Learning that her hero had lied was a disillusioning experience for the young fan.
• The documentary was disillusioning, revealing corruption in an industry she had admired.
• His disillusioning behavior toward his friends changed how they viewed him.
• The report's findings were disillusioning for those who had invested their hopes in the project.
• She found the behind-the-scenes reality of the film industry quite disillusioning.
• The meeting proved disillusioning, as the promised changes never materialized.