discontent has 3 distinct synonyms spread across 2 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is content.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a longing for something better than the present situation
Synonyms, antonyms and the broader and narrower relations for discontent come from Princeton University’s WordNet. Full sources and licences.
showing or experiencing dissatisfaction or restless longing
“saw many discontent faces in the room”