Discontent
Part of speech: noun
Definition: Dissatisfaction. A longing for better times or circumstances. A discontented person. (see also malcontent).
Example sentence: Content makes poor men rich; discontent makes rich men poor.
Malcontent
Part of speech: noun
Definition: a person who is not satisfied with current conditions; a discontented person
Part of speech: adjective
Definition: dissatisfied with current conditions; discontented