deadpan

形容词 deadpan:

1. deliberately impassive in manner
   同义词：expressionless, impassive, poker-faced, unexpressive

副词 deadpan:

1. without betraying any feeling

1. Deadpan delivery of the joke.
   用冷淡的表情讲笑话
2. Some people do not catch his deadpan humor, that make it even funny.
   有些人不能了解他那种无表情的幽默，因此更有趣。

dead.pan

n.（名词）
A blank, expressionless face.
冷面孔：茫然的、毫无表情的脸
A person, especially a performer, who has or assumes a blank expression.
面无表情的人，冷面演员：带有或假装出漠然表情的人，尤指演员
adj.（形容词）
Impassively matter-of-fact, as in style, behavior, or expression:
表情冷淡的：泠漠乏味的，如在形式、行为或表情上：
例句：
deadpan delivery of the joke.
用冷淡的表情讲笑话

adv.（副词）
With a blank, expressionless face.
冷若冰霜的：以漠然的、毫无表情的面孔的
v.（动词）
dead.panned,dead.pan.ning,dead.pans
v.tr.（及物动词）
To express in an impassive, matter-of-fact way.
面无表情地：冷淡地、不带感情地表达
v.intr.（不及物动词）
To express oneself in an impassive, matter-of-fact way.
面无表情地表达：以冷淡的不带感情的方式来表达自己