irony has 3 distinct synonyms spread across 1 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.
witty language used to convey insults or scorn
“he used sarcasm to upset his opponent”
incongruity between what might be expected and what actually occurs
“the irony of Ireland's copying the nation she most hated”
Synonyms, antonyms and the broader and narrower relations for irony come from Princeton University’s WordNet. Full sources and licences.
a trope that involves incongruity between what is expected and what occurs