Oct 4 (Reuters) - U.S. workers are much less optimistic about their companies' outlook than they were three months ago, according to a quarterly survey by Glassdoor.com, a website dedicated to workplace issues.

The online poll of about 2,300 U.S. adults found 33 percent feel better about their company's outlook over the next six months, the lowest level of optimism since December 2008. That marked a 7-point drop from the second quarter survey, while the number of people saying their company's outlook has worsened moved up slightly to 14 percent.

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