1. to cause someone to realize that something they believed in is not true or is less good than they thought

1. disappointment resulting from the discovery that something is not as good as one believed it to be

Examples

• The scandal disillusioned many voters about their favorite politician.
• Her first job disillusioned her about the glamour of the fashion industry.
• The team’s poor performance disillusioned their loyal fans.
• His disillusion with the company grew after the layoffs.
• She felt a deep sense of disillusion when she learned the truth.
• The war brought widespread disillusion among the population.
• Don’t let one bad experience disillusion you completely.