3 sentences

1. 这种颓废的音乐容易使人的斗志消沉。

   zhè zhǒng tuí​fèi de yīn​yuè róng​yì shǐ rén de dòu​zhì xiāo​chén.

   This kind of decadent music can easily dampen one's morale.

   Source: Dong Chinese Dictionary

2. 事业的失败让他整个人变得十分颓废。

   shì​yè de shī​bài ràng tā zhěng gè rén biàn de shí​fēn tuí​fèi.

   The failure of his career made him very dispirited.

   Source: Dong Chinese Dictionary

3. 这种颓废的生活方式让他逐渐丧失了斗志。

   zhè zhǒng tuí​fèi de shēng​huó fāng​shì ràng tā zhú​jiàn sàng​shī le dòu​zhì.

   This decadent lifestyle caused him to gradually lose his fighting spirit.

   Source: Dong Chinese Dictionary