Examples

to be pessimistic about sth

对某事感到悲观 → pessimistic

悲观厌世

be pessimistic and world-weary → 悲观

持悲观看法

take a pessimistic (or gloomy) view → 悲观

悲观失望

pessimistic and despondent; disheartened → 悲观

灰色人生观

a pessimistic (or grey) outlook on life → 灰色

灰色的作品

a literary work pessimistic in tone → 灰色

我不该说那些泄气话。

I shouldn't have made those discouraging (or pessimistic) remarks. → 泄气

他就是个愁人， 无论什么事总是想不开。

He is a gloomy person, who always holds a pessimistic view towards things. → 愁人

你别这么想不开， 留得青山在， 不怕没柴烧！

Why are you so pessimistic? While there is life, there is hope. → 留得青山在,不怕没柴烧

他的话语中带着悲观的调子。

There is a pessimistic tone to what he is saying. → 调子