廃頽 はいたい Also written 廃退 Meanings Noun, する verb, Intransitive (moral) decay; (social) decline; decadence; corruption; degeneration; deterioration See also: 退廃 (たいはい). decline (in prosperity); falling into disuse Kanji 廃 abandon. Read as ハイ. 頽 decline; slide. Read as タイ. Jinuma: Japanese Dictionary · Word lists