ADJ-GRADED
(幽默）冷面的；(开玩笑或作弄人时）故意板着脸的，一脸严肃的
Deadpan humour is when you appear to be serious and are hiding the fact that you are joking or teasing someone.
例句
...her natural capacity for irony and deadpan humour...
她天生具有的讥嘲讽刺和冷面幽默才能
She put the letter on the desk in front of me, her face deadpan, not a flicker of a smile.
她把那封信放在我面前的桌子上，故意一脸严肃，没有一丝的笑容。