I can think of no greater expression of defeatism.

我想，这我听悲观失败主论调了。

I'm haunted with gloomy thoughts and sad memories.

我常为悲观思想和悲痛追念所困扰。

She takes a gloomy view of the future.

她对将来很悲观。

He displayed his usual pessimism.

他流出惯有悲观。

The man who is a pessimist before forty-eight knows too much; the man who is an optimist after forty-eight knows too little.

未逾四十八岁悲观主，知道得太多之人；而年逾四十八岁乐观主，知道得太少之人。