quackish

例句：

1. 1. The joke was so stupid that it made everyone laugh.
   那个笑话太愚蠢了，大家都笑了。
2. 2. She looked foolish for not knowing the answer to the question.
   她因为不知道问题的答案而看起来很愚蠢。
3. 3.He was so silly that he fell asleep in class.
   他太傻了，以至于在课堂上睡着了。