One who is extremely pessimistic, and has an annoying habit of always saying bad things are going to happen any chance they get. A pessimistic pest.
My brother is constantly going on about anything and everything that can possibly go wrong. He is such a pestimist.
by Hannibal Cannabis May 25, 2019

Adj- Describing someone who is not an optimist, by any stretch, to the point of being downright annoying.
Also, pestimist, pestimism
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."
Dave: "Gosh Caleb, you're so freaking Pestimistic."
by Pesty May 18, 2009

by Prenouncer September 24, 2019

Having such a distrustful view of life that it becomes harmful for other humans to be in contact with such a person.
He is so pestimistic that he has become toxic for his colleagues.
by CipherGirl April 24, 2023
