decadence
/ˈde-kə-dən(t)s/
noun
the process of becoming decadent : the quality or state of being decadent
a period of decline
the decadence of modern society
deterioration degeneration decadence decline mean the falling from a higher to a lower level in quality, character, or vitality. deterioration implies generally the impairment of value or usefulness. degeneration stresses physical, intellectual, or especially moral retrogression.