foolish名词
foolish名词形式是foolishness，副词形式是foolishly。foolishness意思是愚蠢，愚笨。例如：First love is only a little foolishness and a lot of curiosity初恋就是一点点笨拙外加许许多多好奇。foolish主要用作形容词，意思是愚蠢的，傻的。
1、It was foolish of her to say such a thing=She was foolish to say such a thing.她说出那样的话来，真是太蠢了。
2、He was foolish to leave his car unlocked=He was so foolish as to leave his car unlocked.他真傻，车都没有锁。
foolish，stupid，silly的区别
1、foolish.指无头脑，缺乏常识或判断力，相当汉语的“愚蠢”。
2、stupid.指智力、理解力或学习能力很差，相当汉语的“笨”。
3、silly指头脑简单，傻头傻脑或令人发笑，相当于汉语的“傻”。例如：She is a silly woman，but not a stupid one.她是个头脑简单的女人，但不能算笨。
1、It is foolish to risk skin cancer.
冒患上皮肤癌的风险是愚蠢的。
2、Any action on the basis of such fragmentary evidence would be foolish.
基于如此不完整的证据采取的任何行动都是愚蠢的。
3、It would be foolish to generalize from a single example.
仅从一个事例进行归纳的做法是愚蠢的。
4、He's afraid of looking foolish in front of his friends.
他怕在朋友面前出丑。
5、How could she have been so foolish as to fall in love with him?
她怎么这么傻，竟爱上了他？
6、The accident was my fault─it would be foolish to pretend otherwise.
这次事故是我的过失——装作没有责任那才傻呢。
7、It was a very foolish thing to do.
干那种事很蠢。
8、I felt foolish and a failure.
我自觉是个愚蠢的失败者。
9、She's just a vain,foolish woman.
她不过是个愚蠢自负的女人。
10、Making people feel foolish is emphatically not my strategy
让人出丑显然不是我的策略。
11、I didn't want him to look foolish and be laughed at.
我不希望见到他出丑，被别人嘲笑。
12、For others,especially the young and foolish,the state will temper justice with mercy
对待其他人时，尤其是年轻人和愚蠢的人，国家会刚柔并济。
13、I just stood there feeling foolish and watching him
我只是傻傻地站在那里看着他。
14、It would be foolish to raise hopes unnecessarily
无谓地燃起人们的希望是愚蠢的。
15、I feel how foolish I am to entertain doubts
我竟然心存怀疑，真是太愚蠢了。
16、It was foolish of her to have spent so much money on shoes.
她把那么多的钱花在鞋上真是太傻了。
17、No one can tempt him to do such a foolish thing.
没有人能骗他去干这样的傻事。
18、His foolish behaviour led to his eventual failure.
他的愚蠢行为导致了他最终的失败。
19、His foolish behaviour may put his whole future in jeopardy.
他的愚蠢行为可能会危及他的整个前程。
20、We should learn from the Foolish Old Man's spirit to challenge nature.
要学习老愚公战天斗地的精神。