How to briefly describe the word "cold joke" to foreigners in English

cold joke

A bad joke

There are also cold jokes in English. You can search online. One definition found in Chinese is that the speaker is quite calm and basically expressionless. After listening to it, the listener should be stunned and think about it before he feels funny.

You won't feel funny immediately after the joke teller calmly tells a joke. After a few minutes, you understand its potential meaning and feel funny.