Synonyms for Discontented (same or very similar meaning)
WordNet sense 1 (worried and uneasy):
restlessWordNet sense 2 (in a state of sulky dissatisfaction):
disgruntled, dissatisfiedWordNet sense 3 (discontented as toward authority):
malcontentWordNet sense 4 (showing or experiencing dissatisfaction or restless longing):
discontentFrom the ODE community, based on WordNetadd/edit