<p><strong>Adjective</strong></p><ul><li>marked by or accomplished with a careful pretense of seriousness or calm detachment; impassive or expressionless: deadpan humor.</li><li>displaying no emotional or personal involvement: a deadpan style.</li></ul><p><strong>Adverb</strong></p><ul><li>in a deadpan manner: He spoke his lines utterly deadpan.</li></ul><p><strong>Verb</strong></p><ul><li>(used with or without object), deadpanned, deadpanning: to behave or perform in a deadpan manner.</li></ul><p><strong>Noun</strong></p><ul><li>a face showing no expression.</li><li>a style of comedy that relies on the comedian's maintaining such a face.</li></ul>