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Jyutping jat1 bun2 zing3 ging1
Pinyin yī běn zhèng jīng

Definitions (CC-CEDICT)
  1. in deadly earnest; deadpan
Definitions (粵典–words.hk)
  1. 形容詞
    態度​嚴肅​認真
    in a serious manner
Definitions (Wiktionary)
  1. phrase, idiomatic
    absolutely serious; dead earnest
  2. phrase, idiomatic
    deadpan; with a poker face
    • 一本正經地胡説八道
      一本正经地胡说八道
      yī běn zhèng jīng de hú shuō bā dào
      to talk nonsense with a deadpan face
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    一本正经地胡说八道
    一本正經地胡説八道
    yī běn zhèng jīng de hú shuō bā dào
    • to talk nonsense with a deadpan face