"irony" in the noun sense
1. sarcasm, irony, satire, caustic remark
witty language used to convey insults or scorn
"he used sarcasm to upset his opponent"
"irony is wasted on the stupid"
"Satire is a sort of glass, wherein beholders do generally discover everybody's face but their own"
incongruity between what might be expected and what actually occurs
"the irony of Ireland's copying the nation she most hated"
a trope that involves incongruity between what is expected and what occurs
Source: WordNet® (An amazing lexical database of English)
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