degenerate

那个赌徒整天沉迷于赌博，已经变成了一个堕落的人。

The gambler, addicted to betting all day, has become a ___degenerate.

那个赌徒已经彻底堕落，丧失了所有的廉耻之心。

The gambler has become a complete ___degenerate, losing all sense of decency.

如果长期缺乏锻炼，人的身体机能会逐渐退化。

Without regular exercise, one's physical abilities will ___degenerate over time.