reinforced has 2 distinct synonyms 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
given added strength or support
“reinforced concrete contains steel bars or metal netting”
(used of soaps or cleaning agents) having a substance (an abrasive or filler) added to increase effectiveness
“the built liquid detergents”
Synonyms, antonyms and the broader and narrower relations for reinforced come from Princeton University’s WordNet. Full sources and licences.