deadpan
(Informal)
[adjective]
Synonyms: expressionless, blank, impassive, inexpressive, inscrutable, poker-faced, straight-faced

[TahlilGaran] English Synonym Dictionary ▲

dead‧pan /ˈdedpæn/ adjective
[Date: 1900-2000; Origin: dead + pan 'face' (1900-2000)]
sounding and looking completely serious when you are saying or doing something funny
deadpan voice/expression etc
deadpan humour

[TahlilGaran] Dictionary of Contemporary English ▲

deadpan
an expressionless or emotionless face
My friend had a deadpan expression when he told us the story.

[TahlilGaran] English Idioms Dictionary ▲

deadpan
adj., adv., slang With an expressionless or emotionless face; without betraying any hint of emotion.
She received the news of her husband's death deadpan.

[TahlilGaran] English Idioms Dictionary ▲