deadpan

面无表情的、不动声色的

She told the joke with a completely deadpan expression.

她讲那个笑话时表情完全不动声色。

冷面的、冷调的多指幽默风格

His deadpan humor takes a while to get used to.

他那种冷面幽默要一阵子才习惯。

面无表情地、一本正经地

He delivered the punch line deadpan and waited.

他一本正经地说出笑点，然后就等著。

面无表情的脸、扑克脸

Her perfect deadpan made the whole room laugh.

她那张完美的扑克脸让全场都笑了。

板著脸说、一本正经地说

"I never make mistakes," he deadpanned to the class.

「我从不出错。」他板著脸对全班说。