An imagined state or society in which there is great suffering or injustice typically one that is totalitarian or post-apocalyptic.

The term you're looking for is "dystopia." A dystopian society is often characterized by oppressive governmental control, widespread suffering, and the erosion of individual freedoms. In literature and film, dystopian narratives highlight the consequences of social, political, and technological trends taken to extreme political or moral conclusions.

Examples of dystopian settings include George Orwell's "1984," where surveillance and totalitarianism reign, and Aldous Huxley's "Brave New World," which explores themes of consumerism and the suppression of individuality through pleasure and conditioning. These societies serve as cautionary tales about the potential outcomes of unchecked power, societal neglect, or technological advancement without ethical considerations.