Gambler's stoic expression

• Look that says nothing
• Card player's deadpan expression
• Emotionless look
• You'll get nothing out of a good one
• Asset at the card table
• Gambling asset
• Expressionless visage
• It's blank for a bluff

Wikipedia Word definitions in Wikipedia
Pokerface is a 1986 mini series about a former journalist who works as an undercover agent for Australia's secret service.