deadpan

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pokerinaamalla Deliberately impassive or expressionless (as a face or look).
Having such a face or look (as a person).
Impassive (as behaviour or speech).
In a deadpan manner.
2004, Steven Greenhut, https://books.google.com/books?id=MmfuAAAAMAAJ&q=%22talked+deadpan%22&dq=%22talked+deadpan%22&hl=en&sa=X&ved=0ahUKEwiChKyV0YLLAhUS_mMKHU0eAaYQ6AEIJzAC Abuse of Power: How the Government Misuses Eminent Domain

A city-hired consultant from a firm called Urban Futures was booed repeatedly by the agitated homeowners as he talked deadpan, in bureaucratese, about his firm's "evidentiary record" pointing to blight in the neighborhood.

MAREK: But really the deadpan is key. You can essentially trick people into laughing at nothing.