unreconstructed has no recorded synonym. 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 reconstructed.
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.
adhering to an attitude or position widely held to be outmoded
“peasants are still unreconstructed small capitalists at heart”
Synonyms, antonyms and the broader and narrower relations for unreconstructed come from Princeton University’s WordNet. Full sources and licences.