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Definition of deteriorate : 1. To grow worse; to be impaired in quality; to degenerate.
2. To make worse; to make inferior in quality or value; to impair; as, to deteriorate the mind.

Synonyms:

poison, fell, dismiss, put down, demoralize, demean, decompose, prostitute, strong, fail, drop off, fall, drop down, discharge, strike down, warp, throw off, canker, corrupt, taint, pretermit, bastardize, swing, cheapen, spend, languish, throw, neglect, devolve, deprave, break down, crumble, waste, flag, subvert, shake off, pervert, overlook, leave out, spoil, drip, expend, weaken, send away, escalate, descend into, drop, throw away, miss, thrive, omit, spiral, better, fizzle, overleap, vitiate, degrade, molder, cast, send packing, retrograde, cut down, dribble, lessen, debauch, rot, slip into, knock off, go down, profane, cast off, return, disintegrate, turn, flatten, descend, increase, set down, deepen, abase, shed, pass, dangle, unload

endure, mature, age, season, last, develop, decline, ripen, grow old, mellow

degenerate, dilapidate, sink, fall apart, fade, go downhill, collapse, moulder, putrefy, slump, worsen, regress, ebb, slip, relapse, get worse, wilt, downgrade, retrogress, slide, tergiversate, wane, wither, revert, atrophy, lapse, decay

Usage examples:

• Even if left without care the ground did not deteriorate, but the products took on the character of the times and gradually improved. - "Daybreak: A Romance of an Old World", James Cowan.
• During the heat of summer, however, they deteriorate. - "The Pecan and its Culture", H. Harold Hume.
• The more civilized they grow the more they will let their bodies deteriorate. - "This Simian World", Clarence Day Jr..