Deteriorate

v. t.	1.	To make worse; to make inferior in quality or value; to impair; as, to deteriorate the mind. [imp. & p. p. Deteriorated (dė*tē"rĭ*ô*rā`tĕd); p. pr. & vb. n. Deteriorating (dė*tē"rĭ*ô*rā`tĭng).] The art of war . . . was greatly deteriorated. - Southey.
v. i.	1.	To grow worse; to be impaired in quality; to degenerate. Under such conditions, the mind rapidly deteriorates. - Goldsmith.

Verb	1.	deteriorate - become worse or disintegrate; "His mind deteriorated"
	2.	deteriorate - grow worse; "Her condition deteriorated"; "Conditions in the slums degenerated"; "The discussion devolved into a shouting match" Synonyms: degenerate, devolve, drop Antonyms: convalesce, recover, recuperate - get over an illness or shock; "The patient is recuperating"

agent provocateur, aggravate, alter, ameliorate, amplify, annoy, augment, be changed, be converted into, be renewed, bottom out, break, build up, change, checker, chop, chop and change, come about, come around, come down, come round, crumble, damage, debilitate, decay, decline, decompose, deepen, degenerate, degrade, depreciate, descend, deviate, dilapidate, disimprove, disintegrate, diverge, diversify, embitter, endamage, enhance, enlarge, erode, exacerbate, exasperate, fade, fall back, flag, flop, get worse, go downhill, go to pot, grow worse, harm, haul around, have a comedown, heat up, heighten, hit rock bottom, hot up, hurt, impair, improve, increase, injure, intensify, irritate, jibe, languish, lessen, let down, magnify, make acute, make worse, mar, meliorate, mitigate, modulate, mutate, provoke, put back, reach the depths, regress, relapse, retrograde, retrogress, revive, rot, sharpen, shift, sicken, sink, slacken, slide, slip, slip back, sour, spoil, swerve, tack, take a turn, touch bottom, turn, turn aside, turn into, turn the corner, undergo a change, undermine, vary, veer, warp, weaken, worsen