adjective

impassive or expressionless.

she delivered her monologue in a deadpan voice

blank,expressionless,unexpressive,inexpressive,impassive,inscrutable,poker-faced,straight-faced,dispassionate,unresponsive,stony,wooden,empty,vacant,glazed,fixed,lifeless

adverb

in a deadpan manner.

‘That’s all right then,’ Claire said, deadpan

verb

say something amusing while affecting a serious manner.

‘I’m an undercover dentist,’ he dead-panned