Top Definition
Adj- Describing someone who is not an optimist, by any stretch, to the point of being downright annoying.

Also, pestimist, pestimism
Caleb: "It looks like rain. My glass is half empty. It's only a matter of time before the terrorists Strike Back. Unless the world ends in 2012."

Dave: "Gosh Caleb, you're so freaking Pestimistic."
by Pesty May 18, 2009

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