打不還手，罵不還口 [－－还－－骂－还－]

Jyutping daa2 bat1 waan4 sau2 ， maa6 bat1 waan4 hau2
Pinyin dǎ bù huán shǒu ， mà bù huán kǒu

Definitions (Wiktionary)
  1. phrase, idiomatic
    to be a complete pacifist and not retaliate at all