世纪末

noun

originally referring to the end of the 19th century when European capitalism entered a decadent stage with lurking crises; generally refers to the declining stage of a society

Originally a historical term referring to the Fin de Siècle period in Europe (1880s-1900s), now used more broadly to describe any declining or decadent stage of a society, culture, or era. Often carries connotations of aesthetic decadence, cultural exhaustion, or social crisis.