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Jyutping zing3 ging1 baat3 baak3
Pinyin zhèng jing bā bǎi

Definitions (Wiktionary)
  1. adj, colloquial
    deadly serious; solemn
  2. adj, Mainland-China, colloquial
    worthy of the name; real; true

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Jyutping zing3 ging1 baat3 baak3
Pinyin zhèng jīng bā bǎi

Definitions (CC-CEDICT)
  1. very serious
  2. solemn
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. adj, colloquial
    deadly serious; solemn
  2. adj, Mainland-China, colloquial
    worthy of the name; real; true