institutionalized has 1 distinct synonym spread across 2 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 noninstitutionalized.
officially placed in or committed to a specialized institution
“had hopes of rehabilitating the institutionalized juvenile delinquents”
given the character of an institution or incorporated into a structured and usually well-established system
“institutionalized graft”
Synonyms, antonyms and the broader and narrower relations for institutionalized come from Princeton University’s WordNet. Full sources and licences.
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.