ภาษาอังกฤษวันละคำ : deadpan (DEAD pan)

The adjective deadpan means to be pretending to be serious usually when you are not and often when you are telling a joke or telling a lie. ...

• The navy and the army insist with deadpan faces that they did not violate any humanitarian standards.
• "My assistant still puts my pants on one leg at a time," McBride says, deadpan.
• They handle the movie's moments of humour just as cleverly: They're always deadpan and brief, and funnier because of it.
• "The national team comes first and it comes before my family," said Bilardo with a deadpan expression. ...

(From Bangkok Post)