dry humor
cold joke
bad joke
英语中也有冷笑话。你可以上网搜一下。汉语查到的一个定义为：就是讲的人挺平静的，基本上面无表情。听的人听完后要愣一愣，想一想才感到好笑的笑话。
You will not feel funny immediately after a joke teller tells a joke calmly. After a few minute's, you understand its potential meaning and feel funny.