ADJ-GRADED
(幽默）冷面的；(開玩笑或作弄人時）故意板著臉的，一臉嚴肅的
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...
她天生具有的譏嘲諷刺和冷面幽默才能
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，故意一臉嚴肅，沒有一絲的笑容。