bum 飯桶
scallywag
sculpin

1. 格林先生總是盛氣凌人的樣子。其實，他是個飯桶。
Mr Green is always on his high horse. In fact, he is good for nothing.

2. 你真沒用！你是個飯桶！
You are good for nothing.

3. 不懂裝懂,永世飯桶.
He who knows nothing but pretends to know everything,is indeed a good-for-nothing.

4. 不懂裝懂永遠是飯桶.
He who knows nothing but pretends to know everything,is indeed a good-for-nothing.

5. “他干那工作在行，是不是。”“你是在說笑話吧，他是個十足的飯桶。”
“He’s very good at his jobs, isn’t he?”“You must be joking! He’s absolutely useless.

6. 呵呵，直到有天有個叫洛哈特的飯桶當了黑魔法防御術老師，情況就不同啦。
Well, not until a certain git by the name of Lockhart took over as Defence Against the Dark Arts teacher, at any rate.

7. 你這個飯桶！我命令你，不惜任何代價，都要拿到它！否則我就會把你流放到美國去過苦日子！
You foolish! I order you no matter what you do, you must get it, otherwise you will be sent to USA to suffer!