1
be a pessimist about sth
about 后接引起悲观的事物或话题。
Don't be a pessimist about your future.
不要对自己的未来悲观。
悲观者；悲观主义者；厌世者
先理解核心含义，再看它在真实句子里的用法。
悲观者；悲观主义者；厌世者
a person who expects the worst
Don't be a pessimist about your future.
不要对自己的未来悲观。
习惯性地预期最坏结果的人；凡事看阴暗面的人。
Someone who habitually expects the worst outcome; one who looks on the dark side of things.
Don't be such a pessimist; the weather might clear up by noon.
别这么悲观，中午前天气可能会放晴。
My uncle is a pessimist who always thinks the plane will be delayed.
我叔叔是个悲观主义者，总认为飞机会晚点。
Pessimists often focus on problems instead of solutions.
悲观者常常只关注问题，而不关注解决方法。
about 后接引起悲观的事物或话题。
Don't be a pessimist about your future.
不要对自己的未来悲观。
强调经历使人变得悲观，可用 turn 或 make。
Her repeated failures turned her into a pessimist.
她屡屡失败，成了一个悲观主义者。
act like 为“表现得像”，后接名词。
Stop acting like a pessimist and look on the bright side.
别再表现得像个悲观主义者了，往好处想想。
Not this
He is pessimist.
Use this
He is pessimistic.
pessimist 是名词，不能直接放在 be 动词后作表语来表示人的性质；此时应用形容词 pessimistic。把 pessimist 改成 pessimistic 后，句子才符合“主语 + be + 形容词”的英语结构。
Not this
His pessimist made him quit.
Use this
His pessimism made him quit.
pessimist 指“悲观者”，是具体的人；pessimism 才表示“悲观、悲观主义”这种抽象概念。句中主语要表达的是“他的悲观情绪”，所以应用抽象名词 pessimism，而不是指人的 pessimist。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
天生的悲观主义者
He is a born pessimist and always expects the worst.
他是个天生的悲观主义者，总是做最坏的打算。
生性悲观的人
My father is a pessimist by nature and worries about everything.
我父亲生性悲观，凡事都担心。
对前途悲观的人
She remains a pessimist about the future despite the recent improvements.
尽管近来有所改善，她仍然对未来持悲观态度。
不可救药的悲观主义者
Even after the team's victory, he stayed an incurable pessimist.
即使球队获胜之后，他仍然是一个不可救药的悲观主义者。
悲观者眼中的杯子是半空的（指凡事只看消极的一面）
Before the interview, she was such a pessimist that she saw the glass as half empty and predicted she would fail.
面试前，她非常悲观，只看到消极的一面，预料自己会失败。
悲观者总在每次机会中看到困难（指遇事先想到障碍）
He is a pessimist who sees the difficulty in every opportunity, so he never starts a new project.
他是个悲观者，总在每次机会中看到困难，所以从不开始新项目。
悲观者在每个机会中看到困难；乐观者在每个困难中看到机会。
Even as a pessimist, he tried to prepare for the worst case.
即使是个悲观者，他也努力为最坏的情况做准备。
乐观者宣称我们生活在所有可能世界中最好的一个；悲观者则害怕这句话是真的。
She is such a pessimist that she always expects the plan to fail.
她是个十足的悲观者，总认为计划会失败。
Use pessimist naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 ‘pessimist’ 中的 ‘pessi-’ 像‘怕死’，悲观者总把结果往最坏处想，怕这怕那。
语域：neutral 常见场景：日常交谈、观点讨论、心理或性格描述 “pessimist”是中性偏常见的说法，通常用来指习惯预期最坏结果的人，既可用于日常对话，也见于心理或性格相关的讨论中。正式书面语里同样适用，但语气上并不特别强硬或带有学术色彩。
All these words end in -ist and share the final /ɪst/ sound. Pessimist, optimist, scientist, and journalist all have three syllables with first-syllable stress; artist, dentist, and tourist have two syllables, also with first-syllable stress. Note that tourist has /ʊr/ and journalist has /ɜːr/ before /ɪst/, so their vowel sounds differ from pessimist's /e/. Also, lookalikes like pessimism (not -ist) are pronounced /ˈpesɪmɪzəm/, not with /ɪst/.
Dictionary facts from ECDICT, WIKTIONARY.