DECADENCE
degeneracy, degeneration, decadence, decadency
(noun) the state of being degenerate in mental or moral qualities
Source: WordNet® 3.1
Etymology
Noun
decadence (countable and uncountable, plural decadences)
A state of moral or artistic decline or deterioration; decay
Source: Wiktionary
De*ca"dence, De*ca"den*cy, n. Etym: [LL. decadentia; L. de- + cadere
to fall: cf. F. décadence. See Decay.]
Definition: A falling away; decay; deterioration; declension. "The old
castle, where the family lived in their decadence.' Sir W. Scott.
Source: Webster’s Unabridged Dictionary 1913 Edition