Deadpan

His humour is very deadpan.

"Psst! Mary! Can I borrow a sheet of notebook paper?" Tom tapped Mary's shoulder with his pencil's eraser. "Do you intend to write on it?" Mary asked Tom in a deadpan tone. "Yeah." "Then I don't want it back." Mary handed Tom a sheet of notebook paper.

Comedian Les Dawson was famous for his gravelly, deadpan delivery.

a deadpan face or look

deadpan behaviour or speech

The comedian remained deadpan.

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.

Kidd deadpanned it, stared glassily back at Maitland.