Pessimist (noun)

1. A person who expects the worst possible outcome in any situation.
2. A person who has a generally negative outlook on life.

Origin:

From the latin word pessimus meaning "worst" and the greek word peismós meaning "fear, expectation".

Examples:

1. The economist is a pessimist, he expects a recession in the near future.
2. The pessimist is always expecting the worst.
3. The optimist sees the glass as half full, while the pessimist sees it as half empty.
4. The pessimist believes that things will never get better.
5. The pessimist is always looking on the negative side of things.