deadpan in English

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adj. showing no expression or feeling.
Ex. a deadpan comedian, deadpan language, a deadpan news story.
(SYN) expressionless, poker-faced.

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adv. in a deadpan manner.
Ex. The lines were read deadpan. The official Yugoslav newspaper, Borba, reprinted--deadpan--a Pravda article (Newsweek).

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deadpan, noun, adjective, adverb, verb, -panned,-panning.
(Slang.)

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noun an expressionless face, person, or manner.

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v.t., v.i. to act or perform in a deadpan manner.
Ex. to deadpan a joke, to deadpan through a party.