在英语中，"不聪明"通常用"stupid"来表示。这个词有贬义，意思是没有智力或没有能力理解或做出正确的决定。
例句：
He's so stupid, he can't even tie his own shoes. (他太蠢了，连系鞋带都不会。)
Don't be stupid. You know better than that. (别蠢了。你应该知道这件事情更好。)
She's not exactly a genius, but she's not stupid either. (她并不是真正的天才，但也不是傻子。)
注意：使用这个词可能会冒犯人，所以应该谨慎使用。
例句：
He's so stupid, he can't even tie his own shoes. (他太蠢了，连系鞋带都不会。)
Don't be stupid. You know better than that. (别蠢了。你应该知道这件事情更好。)
She's not exactly a genius, but she's not stupid either. (她并不是真正的天才，但也不是傻子。)
注意：使用这个词可能会冒犯人，所以应该谨慎使用。