An unsatisfied person is one who is not content, who feels that something or someone has not met his expectations, who is not pleased with some condition or situation: "Your explanation leaves me unsatisfied." "Although growing teen-agers eat a great deal, their hunger is often unsatisfied." Dissatisfied means "displeased," "offended," "upset": "I am dissatisfied with the salary I am paid." "He had a sulky, dissatisfied expression on his face."
Dictionary of problem words and expressions. Harry Shaw. 1975.