cant (1)EnglishOxford American Thesauruscant1 noun 1 religious cant: hypocrisy, sanctimoniousness, sanctimony, humbug, pietism, affected piety, insincerity, sham, lip service, empty talk, pretense; rare Pharisaism, Tartufferie. ▷antonyms sincerity. 2 thieves' cant: slang, jargon, idiom, argot, patter, patois, vernacular, speech, terminology, language; informal lingo, -speak, -ese.