Disillusionment (noun)

1. The act or condition of being disenchanted or disappointed.
2. The condition of being disillusioned, or the process of becoming so.

Origin:

Late 18th century. from french désillusion or directly from dis- + illusion.

Examples:

1. The company's rapid growth and subsequent downfall led to a widespread disillusionment among its investors.
2. She felt a great deal of disillusionment after discovering that her hero was a fraud.
3. The young man was filled with disillusionment after his dream of becoming a professional athlete was shattered.
4. The disillusionment of the public with politicians is evident in the low voter turnout.
5. Her disillusionment with the political system was evident in her decision to no longer vote.