Optim = best
* optimism
n. 樂觀，樂觀主義
He was still full of optimism for the future despite his many problems.
他盡管有許多問題，但對未來仍十分樂觀。
* optimistic
a. 樂觀的，有信心的
She's not optimistic about the outcome.
她對結果不很樂觀。
* optimist
n. 樂觀主義者
He's such an optimist that he's sure he'll soon find a job.
他很樂觀，認為自己一定很快就能找到工作。

* pessimism
n. 悲觀主義
There is a mood of pessimism in the company about future job prospects.
公司中有一種對未來職場前景悲觀的情緒。
* pessimistic
a. 悲觀的
a pessimistic view of the world
對世界的悲觀主義看法
* pessimist
n. 悲觀主義者
It's easy to sell insurance to a pessimist.
向悲觀的人推銷保險很容易。