樹不要皮必死無疑，人不要臉天下無敵 [树－－－－－无－－－－－脸－－无敌]

Jyutping syu6 bat1 jiu3 pei4 bit1 sei2 mou4 ji4 ， jan4 bat1 jiu3 lim5 tin1 haa6 mou4 dik6
Pinyin shù bù yào pí bì sǐ wú yí ， rén bù yào liǎn tiān xià wú dí

Definitions (Wiktionary)
  1. proverb
    A shameless person is undefeatable and difficult to deal with.