degenerative

形容词 degenerative:

1. (of illness) marked by gradual deterioration of organs and cells along with loss of function

de.gen.er.a.tive

adj.（形容词）
Of, relating to, causing, or characterized by degeneration:
衰退的：堕落的，引起变性的，或有退化的特征的：
例句：
a degenerative disease.
一种变性疾病