troubled has 4 distinct synonyms spread across 1 of its 2 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 untroubled.
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.
characterized by or indicative of distress or affliction or danger or need
“troubled areas”
characterized by unrest or disorder or insubordination
“effects of the struggle will be violent and disruptive”
Synonyms, antonyms and the broader and narrower relations for troubled come from Princeton University’s WordNet. Full sources and licences.