玩世不恭 is a four-character idiom that describes a person who treats worldly conventions, rules, and norms with casual indifference or open disregard — often adopting a detached, ironic, or cynical attitude toward life. It carries a slightly literary or judgmental tone and is used to characterize someone who rejects seriousness or flouts social expectations with a kind of smug nonchalance. Unlike English 'cynical', the Chinese term highlights a performative 'playing with the world' rather than a deep-seated distrust of motives.