pessimist

The pessimist said the project would fail even before we started working on it.

(Chinese) 还没等我们开始，那个悲观主义者就说这个项目会失败。

An optimist sees the glass as half full, while a pessimist sees it as half empty.

(Chinese) 乐观主义者看到杯子里的水是半满的，而悲观主义者看到的是半空的。