noun which may take the genitive case particle 'no'
degenerative; regressive; retrogressive
Medical/technical term describing a condition or process that involves deterioration or a return to a less developed state. Often used in compound phrases like 退行性変化 (degenerative change) or 退行性疾患 (degenerative disease).
Degenerative changes associated with aging are seen in the joints.
This disease is classified as a degenerative neurological disorder.