condescension has 5 distinct synonyms spread across 3 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. 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.
the trait of displaying arrogance by patronizing those considered inferior
a communication that indicates lack of respect by patronizing the recipient
affability to your inferiors and temporary disregard for differences of position or rank
“the queen's condescension was intended to make us feel comfortable”
Synonyms, antonyms and the broader and narrower relations for condescension come from Princeton University’s WordNet. Full sources and licences.