Simple past tense and past participle of deteriorate.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "deteriorated" in a sentence
"The site gradually deteriorated from a discussion board to?"
"Logan had to check up on the chap, of course, in order to let him have it, which meant examining the hand writing — which had apparently deteriorated from the days when in New England Jonathan Edwards wrote fairly illegibly."
"People whose financial situation has deteriorated, which is almost half the country voted overwhelmingly for Barack Obama."