煞有介事 [－－－－]

Jyutping saat3 jau5 gaai3 si6
Pinyin shà yǒu jiè shì

Definitions (CC-CEDICT)
  1. to make a show of being very much in earnest (idiom)
  2. to act as if one is taking things very seriously
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    in all apparent seriousness
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）