Dry humor, often referred to as deadpan humor, is a form of comedic delivery in which something humorous is said or done by a person, while not exhibiting a change in emotion or facial expression. deadpan本身形容某人面无表情；deadpan humor或者是dry humor是讲笑话的一种表现形式，表演者往往心平气和地表演，和那些手舞足蹈，阴阳顿挫的讲笑话形式形成对比。冷面笑话因此很讲究语言的运用。

Examples:

She told the joke deadpan. (adv.)她面无表情地讲这个笑话。

Some people find it harder to catch a deadpan humor, which makes it more charming.一些人认为冷面笑话更难理解，这让它更具魅力。