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Jyutping fuk1 haak1
Pinyin fù hēi

Definitions (粵典–words.hk)
  1. 形容詞、外來語、潮語
    表面​友善​但​係​心底​裏​陰險​或者​有​機心
    used to describe a person who seems nice and friendly yet malicious from the bottom of heart
    • 唔好睇佢成日笑騎騎啊,其實佢好腹黑㗎。
      唔好睇佢成日笑骑骑啊,其实佢好腹黑㗎。
      m4 hou2 tai2 keoi5 siu3 ke4 ke4 aa3, kei4 sat6 keoi5 hou2 fuk1 haak1 gaa3.
      Don't be deceived by her usual smile. She is in fact quite malicious.

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Jyutping fuk1 hak1
Pinyin fù hēi

Definitions (CC-CEDICT)
  1. (slang) outwardly kind but inwardly evil
  2. two-faced
Definitions (粵典–words.hk)
  1. 形容詞、外來語、潮語
    表面​友善​但​係​心底​裏​陰險​或者​有​機心
    used to describe a person who seems nice and friendly yet malicious from the bottom of heart
    • 唔好睇佢成日笑騎騎啊,其實佢好腹黑㗎。
      唔好睇佢成日笑骑骑啊,其实佢好腹黑㗎。
      m4 hou2 tai2 keoi5 siu3 ke4 ke4 aa3, kei4 sat6 keoi5 hou2 fuk1 haak1 gaa3.
      Don't be deceived by her usual smile. She is in fact quite malicious.
Definitions (Wiktionary)
  1. adj
    being outwardly kind but inwardly cruel
Examples (粵典–words.hk)
  1. Cantonese
    唔好睇佢成日笑骑骑啊,其实佢好腹黑㗎。
    唔好睇佢成日笑騎騎啊,其實佢好腹黑㗎。
    m4 hou2 tai2 keoi5 siu3 ke4 ke4 aa3, kei4 sat6 keoi5 hou2 fuk1 haak1 gaa3.
    • Don't be deceived by her usual smile. She is in fact quite malicious.