形容词

1. (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.

1. deliberately impassive in manner

e.g. deadpan humor
his face remained expressionless as the verdict was read

Synonym: expressionlessimpassivepoker-facedunexpressive