Degenerative

[dɪ'dʒen(ə)rətɪv] or [dɪ'dʒɛnərətɪv]

(adj.) (of illness) marked by gradual deterioration of organs and cells along with loss of function; 'degenerative diseases of old age' .

Checked by Gwen--From WordNet

(a.) Undergoing or producing degeneration; tending to degenerate.

Editor: Rae