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be a knucklehead
直接评判他人智力低下的常用说法。
Don't be a knucklehead.
别犯傻了。
蠢人; 用于表达对某人智力的低评价
先理解核心含义，再看它在真实句子里的用法。
蠢人; 用于表达对某人智力的低评价
a stupid person; these words are used to express a low opinion of someone's intelligence
Don't be a knucklehead.
别犯傻了。
愚蠢的人；这些词用于表达对某人智力的低评价
a stupid person; these words are used to express a low opinion of someone's intelligence
Don't be such a knucklehead; you should have checked the map before driving.
别这么蠢；你开车前本该查一下地图的。
Some knucklehead left the freezer door open all night, and all the ice cream melted.
哪个傻瓜让冰箱门开了一整夜，冰淇淋全化了。
He felt like a real knucklehead after realizing he had been wearing mismatched shoes all day.
当他意识到自己一整天都穿着不配对的鞋子后，觉得自己真是个傻瓜。
直接评判他人智力低下的常用说法。
Don't be a knucklehead.
别犯傻了。
表示用言语贬低某人智力。
Why did you call me a knucklehead?
你为什么叫我傻瓜？
用作直接称呼，常带调侃或责备语气。
You knucklehead, you forgot your keys again!
你这个傻瓜，又把钥匙忘了！
Not this
He is very knucklehead.
Use this
He is a knucklehead.
knucklehead是名词，不能直接用作形容词；应加上冠词a并用作名词谓语。
Not this
He is knucklehead.
Use this
He is a knucklehead.
可数名词单数前需要不定冠词a；缺少冠词是错误的。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
骂某人蠢货
My brother called me a knucklehead for forgetting his birthday.
我哥哥因为我不记得他的生日而骂我蠢货。
愚蠢的举动
Leaving the stove on was a knucklehead move.
忘了关炉子真是个愚蠢的举动。
你这个蠢货
Stop hitting your sister, you knucklehead!
别打你妹妹了，你这个蠢货！
一群蠢货
A bunch of knuckleheads left trash all over the beach.
一群蠢货在海滩上到处扔垃圾。
十足的蠢货
He lost his keys again; he's a real knucklehead.
他又把钥匙弄丢了，真是个十足的蠢货。
你这个蠢货！
Moe Howard's catchphrase in The Three Stooges, a classic American comedy team known for slapstick.
这是莫伊·霍华德在经典美国喜剧组合《活宝三人组》中的口头禅，该组合以打闹喜剧闻名。
Use knucklehead naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
knuckle（指关节）+head（头）：想象脑袋硬得像指关节、不会转弯，就是蠢人 knucklehead。
语域：informal 常见场景：casual conversation、friendly teasing knucklehead 通常用于非正式场合，常带有戏谑或轻微贬义，多出现在朋友或熟人之间的玩笑或吐槽中，语气不算正式严厉。
常用于贬义，形容智力低下的人。
Dictionary facts from ECDICT, WIKTIONARY.