Antiphrasis

(n.) The use of words in a sense opposite to their proper meaning; as when a court of justice is called a court of vengeance.

Thesaurus Entries

Gothicism, Irish bull, Neanderthalism, age of ignorance, animality, antiphrasis, bad taste, barbarity, barbarousness, benightedness, benightment, bestiality, bombasticness, brutality, brutishness, cacology, cacophony, clumsiness, coarseness, colloquialism, corruption, crudeness, cumbrousness, dark, dark age, darkness, dysphemism, error, foreignism, gracelessness, grossness, harshness, heathenism, heaviness, ill breeding, ill-balanced sentences, impoliteness, impropriety, impurity, incivility, inconcinnity, incorrectness, indecorousness, inelegance, inelegancy, infelicity, lack of finish, lack of polish, lapse, leadenness, localism, malaprop, malapropism, misconstruction, missaying, misusage, misuse, neologism, paganism, philistinism, pompousness, ponderousness, poor diction, roughness, rudeness, savagery, savagism, sesquipedalianism, sesquipedality, shibboleth, slang, slip, slipshod construction, solecism, spoonerism, stiltedness, taboo word, tastelessness, troglodytism, turgidity, uncivilizedness, uncouthness, uncultivatedness, uncultivation, unculturedness, unenlightenment, uneuphoniousness, ungracefulness, ungrammaticism, unrefinement, unseemliness, unwieldiness, vernacularism, vulgarism, vulgarity, wildness