Dissatisfaction (noun)

1. A feeling of disappointment or discontent with something or someone.
2. The state or condition of not being satisfied or content.

Origin:

Late middle english (also in the sense "displeasure, anger"): from dis- (expressing negation) + satisfaction.

Examples:

1. The employees expressed their dissatisfaction with their working conditions.
2. His dissatisfaction with the service led him to file a complaint.
3. The dissatisfaction among the students with the new curriculum was evident.
4. The dissatisfaction with the election results led to protests.
5. Her dissatisfaction with her job led her to start her own business.