一本正经 一本正經

    yīběnzhèngjīng

    1. Idiomin deadly earnest; deadpan (idiom)

    他一本正经地告诉我这个笑话,我差点相信了。Tā yīběnzhèngjīng de gàosu wǒ zhège xiàohua, wǒ chàdiǎn xiāngxìn le.He told me the joke deadpan, and I nearly believed it.