Definition of deadpan adjective from the Oxford Advanced Learner's Dictionary

 

deadpan

 adjective
adjective
BrE BrE//ˈdedpæn//
 
; NAmE NAmE//ˈdedpæn//
 
 
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without any expression or emotion; often pretending to be serious when you are joking deadpan humour She looked up, completely deadpan.
See the Oxford Advanced American Dictionary entry: deadpan