Dissatisfaction

[Sarah]

The state of being dissatisfied, unsatisfied, or discontented;uneasiness proceeding from the want of gratification, or fromdisappointed wishes and expectations.The ambitious man has little happiness, but is subject to muchuneasiness and dissatisfaction. Addison.

[Sarah]

A lack of satisfaction (that is, being unhappy, typically about something or someone).

[Vania]

Lack of satisfaction.