deteriorate

[dih-teer-ee-uh-reyt]
verb (used with object), verb (used without object), deteriorated, deteriorating.
1.
to make or become worse or inferior in character, quality, value, etc.
2.
to disintegrate or wear away.

Origin:
1565–75; < Late Latin dēteriōrātus made worse (past participle of dēteriōrāre), equivalent to Latin dēterior worse ( from + -ter- formative in adjectives of spatial orientation (cf. exterior, interior) + -ior comparative suffix) + -ātus -ate1

deteriorative, adjective
undeteriorated, adjective
undeteriorating, adjective
undeteriorative, adjective


1. degenerate, decline, worsen.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deteriorate (dɪˈtɪərɪəˌreɪt)
 
vb
1.  to make or become worse or lower in quality, value, character, etc; depreciate
2.  (intr) to wear away or disintegrate
 
[C16: from Late Latin dēteriōrāre, from Latin dēterior worse]
 
deterio'ration
 
n
 
de'teriorative
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

deteriorate
1570s, from L.L. deterioratus, pp. of deteriorare "get worse," from L. deterior "worse," contrastive of *deter "bad, lower," from PIE *de-tero-, from demonstrative stem *de- (see de). Originally transitive in English; intransitive sense is from 1758.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deteriorate de·te·ri·o·rate (dĭ-tēr'ē-ə-rāt')
v. de·te·ri·o·rat·ed, de·te·ri·o·rat·ing, de·te·ri·o·rates

  1. To grow worse in function or condition.

  2. To weaken or disintegrate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Even through a deteriorating economy, their services remain on high demand.
Hospital doctors and nurses went on strike to begin three days of protests over
  deteriorating working conditions.
Consumers seem to have been rattled by lower share prices and deteriorating job
  prospects.
Deteriorating roads and railways and high energy costs are major problems.
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