形容词
中文翻译：愚蠢的
同义词：
['stupid', 'foolish', 'unintelligent']
例句：
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1. He's a knuckleheaded idiot who thinks he can solve all the problems on his own.
他是个自以为是的笨蛋，以为他能独自解决所有问题。
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2. She was knuckleheaded and didn't realize how much she had lost.
她很愚蠢，没有意识到她失去了多少。
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3. The manager was knuckleheaded and didn't take the team seriously.
经理很愚蠢，没有把团队当回事。