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Jyutping joek6 mou4 kei4 si6
Pinyin ruò wú qí shì

Definitions (CC-CEDICT)
  1. as if nothing had happened (idiom); calmly
  2. nonchalantly
Definitions (粵典–words.hk)
  1. 語句
    當​冇​事​發生過
    (lit.) as if nothing has happened; (fig.) indifferent and calm; to act as if nothing has happened
    • 佢俾老細鬧完之後,竟然可以若無其事噉做嘢。
      佢俾老细闹完之后,竟然可以若无其事噉做嘢。
      After he was told off by the boss, surprisingly he could continue to do his work as if nothing had happened.
Definitions (Wiktionary)
  1. phrase, idiomatic
    calm; composed; uncaring; impervious; nonchalant
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他虽然摆着一副若无其事的样子,但是我想他心里一定担心得不得了。
    他雖然擺着一副若無其事的樣子,但是我想他心裏一定擔心得不得了。
    tā suī rán bǎi zhe yī fù ruò wú qí shì de yàng zi , dàn shì wǒ xiǎng tā xīn li yī dìng dān xīn dé bù dé liǎo 。
    • He'll never show it, but I think that deep down, he's seriously worried.
Examples (粵典–words.hk)
  1. Cantonese
    若无其事
    若無其事
    joek6 mou4 kei4 si6
    • to act as if it did not happen
  2. Cantonese
    你做咁多衰嘢仲当若无其事咁,知唔知丑㗎你?
    你做咁多衰嘢仲當若無其事咁,知唔知醜㗎你?
    nei5 zou6 gam3 do1 seoi1 je5 zung6 dong3 joek6 mou4 kei4 si6 gam2, zi1 m4 zi1 cau2 gaa3 nei5?
    • You have done so many bad things but you act as if nothing has happened. Do you have any sense of shame?
  3. Cantonese
    佢俾老细闹完之后,竟然可以若无其事噉做嘢。
    佢俾老細鬧完之後,竟然可以若無其事噉做嘢。
    • After he was told off by the boss, surprisingly he could continue to do his work as if nothing had happened.