deadpan

[ded-pan]
adjective
1.
marked by or accomplished with a careful pretense of seriousness or calm detachment; impassive or expressionless: deadpan humor.
2.
displaying no emotional or personal involvement: a deadpan style.
adverb
3.
in a deadpan manner: He spoke his lines utterly deadpan.
verb (used without object), verb (used with object), deadpanned, deadpanning.
4.
to behave or perform in a deadpan manner.
noun Also, dead pan.
5.
a face showing no expression.
6.
a style of comedy that relies on the comedian's maintaining such a face.

Origin:
1925–30, Americanism; dead + pan1

dead panner, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deadpan (ˈdɛdˌpæn)
 
adj, —adv
with a deliberately emotionless face or manner: deadpan humour

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

deadpan
1928, from dead + pan in slang sense of "face."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His deadpan evocation of flat, bright figures had an everyday quality that
  linked them to commercial art and popular culture.
Then you enter a script to make those characters speak, in their deadpan robot
  tones.
She can subtly seethe with quiet rage, then ever-so-smoothly switch to deadpan
  humor and remain equally convincing.
Their deadpan earnestness in improbable situations helps make this broad comedy
  work.
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