pessimist

[L. pessimus worst: cf. F. pessimiste.]

1. (Metaph.) One who advocates the doctrine of pessimism; -- opposed to optimist.

2. One who looks on the dark side of things.

Pes·si·mist
Pes·si·mis·tic , a.

(Metaph.) Of or pertaining to pessimism; characterized by pessimism; gloomy; foreboding. «Giving utterance to pessimistic doubt.» Encyc. Brit.

Definition: person who expects bad outcome
Antonyms: optimist