Your brother tells jokes without laughing, so you can never tell whether he's joking. You're talking about him with your daughter, and she says, "He has a weird sense of humor." You agree, and you want to describe his sense of humor more specifically. You say:
It's very dry.
A person with a "dry" sense of humor often says funny things with a serious, calm expression. They don't smile, laugh, or make silly faces.
Some people really like a dry sense of humor; other people don't understand it very well. it can be either positive or negative to say that someone has a "dry" sense of humor.
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