JMdict entry #1679710

1. noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verb (moral) decay; (social) decline; decadence; corruption; degeneration; deterioration
   see: 退廃・1
2. noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verb decline (in prosperity); falling into disuse