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Longman Dictionary of Contemporary English
poker-faced
adjective
EXAMPLES FROM OTHER ENTRIES
▪ Not even Will Rogers could make the poker-faced President laugh.
EXAMPLES FROM CORPUS
▪ He champed on his gum in time to the music, and kept a poker-faced expression.
▪ The checkers at the airport were poker-faced but affable.
▪ Throughout his treatise Pope maintains the pose of the poker-faced instructor.
Wiktionary
poker-faced

a. Wearing a poker face: studiously neutral in facial expression; giving nothing away.

WordNet
poker-faced

adj. deliberately impassive in manner; "deadpan humor"; "his face remained expressionless as the verdict was read" [syn: deadpan, expressionless, impassive, unexpressive]

Usage examples of "poker-faced".

Her inventions were seamless, she was the best poker-faced liar in the world, so there would be a kiss goodbye for stupid Crake, a smile, a wave, a closed door, and the next minute there she would be, with Jimmy.

Lizzie laughed, and Gonzales, poker-faced, looked at her and thought, yeah, this guy's laughable all right.

But Lieutenant Flynn, who'd have been a captain in the army, turned out to be a sandy-haired and politely poker-faced cuss with eyes the same shade of gray as two oysters on the half shell going stale.

Greenjeans, a proper second banana, was poker-faced but the Captain mugged each time he passed the camera.

It turned out to have all been an unfortunate mix-up, he said, completely poker-faced, but it took some time to clear up.