Etymology
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deadpan (adj.)

also dead-pan, 1928, of the face, "expressionless, impassive," from dead (adj.) + pan (n.) in the slang sense of "face." As a noun by 1933, "expressionless face." As a verb by 1934. Related: Deadpanned.

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Definitions of deadpan
1
deadpan (adv.)
without betraying any feeling;
she told the joke deadpan
2
deadpan (adj.)
deliberately impassive in manner;
deadpan humor
Synonyms: expressionless / impassive / poker-faced / unexpressive
From wordnet.princeton.edu