noun
Etymology: poker (II)
1.
a.
(1) : a face that does not reveal the feelings or thoughts of a person : a woodenly expressionless face : dead pan
conceals his emotions behind a poker face — P.G.Wodehouse
(2) : a stolidly grave or solemn face
they play their silly roles with poker faces
b. : one that has or that assumes a poker face
asked why those poker faces had been invited to the party
2. : stolid gravity or solemnity of manner
wrote all this nonsense with a poker face