1
it is folly to do sth
it作形式主语，真正主语是不定式短语。
It is folly to spend all your money on lottery tickets.
把所有钱都花在彩票上是愚蠢的。
愚蠢；愚昧；鲁莽
先理解核心含义，再看它在真实句子里的用法。
愚蠢；愚昧；鲁莽
Foolishness or lack of good sense, especially when it causes unwise actions.
It is folly to spend all your money on lottery tickets.
把所有钱都花在彩票上是愚蠢的。
因缺乏远见或务实精神而导致的愚蠢。
Foolishness that results from a lack of foresight or lack of practicality.
一丛树,尤指位于山顶或开阔地上的树丛。
A clump of trees, particularly one on the crest of a hill (or sometimes on a stretch of open ground).
愚昧或鲁莽行事的特质
the trait of acting stupidly or rashly
导致悲剧后果的轻率行为。
Thoughtless action resulting in tragic consequence.
It was sheer folly to invest all his savings in that risky scheme.
把所有积蓄都投资在那个高风险计划中是极其愚蠢的。
AI contextual example
The castle turned out to be a costly folly that nobody wanted to live in.
那座城堡结果变成了一座没人想住的昂贵又愚蠢的建筑。
AI contextual example
Realizing his folly, he apologized for his harsh words.
意识到自己的愚蠢后，他为自己刻薄的话语道了歉。
AI contextual example
trying to drive through a blizzard is the height of folly
试图在暴风雪中开车是愚蠢至极。
WordNet
it作形式主语，真正主语是不定式短语。
It is folly to spend all your money on lottery tickets.
把所有钱都花在彩票上是愚蠢的。
the folly of + 动名词短语，表示……的愚蠢行为。
He later realized the folly of his decision.
他后来意识到自己决定的愚蠢。
commit a folly 是固定搭配，意为'做蠢事'。
She committed a folly by trusting him blindly.
她盲目信任他，犯了一个愚蠢的错误。
Not this
He made a folly decision.
Use this
He made a foolish decision.
Folly 是名词，不能直接修饰名词；应该用形容词 foolish。
Not this
It is a folly to waste time.
Use this
It is folly to waste time.
在“It is folly to do”结构中，folly 作为不可数抽象名词，通常不加冠词 a。
Not this
He did many follies in his youth.
Use this
He showed much folly in his youth.
Folly 指“愚蠢”概念时通常为不可数名词，复数 follies 多指具体愚蠢行为，但在此处表达总括性“愚蠢”应用不可数形式。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
犯愚蠢的错误
He committed a folly by investing all his savings in that risky scheme.
他把所有积蓄都投资于那个冒险计划，犯下了愚蠢的错误。
十足的愚蠢
It would be sheer folly to try to climb the mountain in this weather.
在这种天气试图爬山简直是十足的愚蠢。
做某事的愚蠢
The folly of ignoring climate change is becoming increasingly apparent.
忽视气候变化的愚蠢越来越明显。
人类的愚蠢
The novel is a satire on human folly and greed.
这部小说是对人类愚蠢和贪婪的讽刺。
做某事是愚蠢的
It is folly to believe that you can succeed without hard work.
相信不努力就能成功是愚蠢的。
年轻的愚蠢
He later regretted the folly of his youth.
他后来后悔年轻时的愚蠢。
愚蠢的行为
Investing all his money in that scheme was an act of folly.
把他所有的钱都投资在那个计划上是一个愚蠢的行为。
犯傻
She committed a folly by quitting her job without a backup plan.
她在没有后备计划的情况下辞职，犯傻了。
Use folly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把folly联想成fool（傻瓜）和李（Lee），一个叫李的傻瓜做了蠢事。
多用于正式或文学语境，指愚蠢或鲁莽的行为，常见于散文、小说或道德批评中。
All listed words rhyme with 'folly' in standard British English (stressed vowel /ɒ/ followed by /li/). In American English, the vowel may shift to /ɑː/.
Dictionary facts from ECDICT, WIKTIONARY.