Synonyms for Discontent (same or very similar meaning)
WordNet sense 1 (a longing for something better than the present situation):
discontentment, discontentednessWordNet sense 2 (in a state of sulky dissatisfaction):
dissatisfiedWordNet sense 3 (discontented as toward authority):
malcontentWordNet sense 4 (showing or experiencing dissatisfaction or restless longing):
discontentedFrom the ODE community, based on WordNetadd/edit