Past tense of deadpan; delivered something with a completely expressionless face, especially something humorous.
From 'deadpan' (expressionless face or delivery) plus '-ed' (past tense suffix). This transforms the adjective into a verb, allowing the concept to describe an action or performance.
The verb form 'deadpanned' is relatively recent in English—most linguistic sources place its common usage in the 20th century as deadpan comedy became a recognized performance style through vaudeville, silent film, and later stand-up.
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