Disillusioned

He felt disillusioned after discovering that his favorite band lip-synced during their concert.

Sarah became disillusioned with her favorite band when she saw them lip-syncing during their live concert.

After working for the company for several years without any promotion, John became disillusioned with his career prospects.

The students were disillusioned with their teacher when they realized she was grading them unfairly.

The environmentalists were disillusioned with the government's lack of action on climate change.

Mary became disillusioned with the police force after experiencing racial profiling and discrimination.