Indignation

[ in-dig-ney-shuhn ]

noun

1. anger or annoyance provoked by what is perceived as unfair treatment.

Examples of indignation in a sentence:

• After being mistreated by his boss for years, the angry assistant harnessed his indignation and told his employer how resentful he was. 
• Full of indignation, the wife finally got fed up and left her cheating husband.