Webster’s Revised Unabridged Dictionary · 1913
Deteriorate
De·te′ri·o·rate (dē·tē′rĭ·ō·rāt), v. t. [imp. & p. p. Deteriorated (- rā′tĕd); p. pr. & vb. n. Deteriorating (-rā′tĭng).] [L. deterioratus, p. p. of deteriorare to deteriorate, fr. deterior worse, prob. a comparative fr. de down, away.] To make worse; to make inferior in quality or value; to impair; as, to deteriorate the mind. Whately.
The art of war . . . was greatly deteriorated. Southey.
De·te′ri·o·rate (dē·tē′rĭ·ō·rāt), v. i. To grow worse; to be impaired in quality; to degenerate.
Under such conditions, the mind rapidly deteriorates. Goldsmith.