Etymology
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deteriorate (v.)

1640s, transitive, "make worse, reduce in quality," from Late Latin deterioratus, past participle of deteriorare "get worse; make worse," from Latin deterior "worse, lower, inferior, meaner," contrastive of *deter "bad, lower," from PIE *de-tero-, from demonstrative stem *de- (see de). Intransitive sense "grow worse, degenerate" is by 1758. Related: Deteriorated; deteriorating.

updated on August 04, 2018

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Definitions of deteriorate from WordNet

deteriorate (v.)
become worse or disintegrate;
His mind deteriorated
deteriorate (v.)
grow worse;
Her condition deteriorated
Synonyms: devolve / drop / degenerate
From wordnet.princeton.edu, not affiliated with etymonline.