(as) dumb as a coal bucket
01
蠢得要命, 没脑子
extremely unintelligent or lacking in common sense
humorous
idiom
informal
例子
He could n't figure out how to operate the simplest machinery. Honestly, he's as dumb as a coal bucket.
别这么蠢,动点常识。
蠢得要命, 没脑子