If you say that a person or society is decadent, you think that they have low moral standards and are interested mainly in pleasure.
例句
...restrictions on the number of decadent western films that were allowed to be shown.對頹靡的西方電影在上映數(shù)量上的限制...the excesses and stresses of their decadent rock 'n' roll lifestyles.他們頹廢的搖滾生活的種種放浪及層層重壓
英漢詞典釋義
n.
（道德或藝術(shù)上的）衰落, 墮落, 頹廢
The decadence of morals is bad for a nation.道德的墮落對國家是不利的。
英英詞典釋義
Noun
1. the state of being degenerate in mental or moral qualities