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Jyutping gaa2 zing3 ging1
Pinyin jiǎ zhèng jing

Definitions (Wiktionary)
  1. adj
    pretending to be serious or morally decent; hypocritical; sanctimonious; prudish

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Jyutping gaa2 zing3 ging1
Pinyin jiǎ zhèng jīng

Definitions (CC-CEDICT)
  1. demure
  2. prudish
  3. hypocritical
Examples (粵典–words.hk)
  1. Cantonese
    斯文男子生鸡精,密实姑娘假正经
    斯文男子生雞精,密實姑娘假正經
    si1 man4 naam4 zi2 saang1 gai1 zing1, mat6 sat6 gu1 noeng4 gaa2 zing3 ging1
    • refined on the outside, but perverted and desperate on the inside