毫不留情 [－－－－]

Jyutping hou4 bat1 lau4 cing4
Pinyin háo bù liú qíng

Definitions (CC-CEDICT)
  1. to show no quarter
  2. ruthless
  3. relentless
Definitions (Wiktionary)
  1. phrase, idiomatic
    to show no mercy; ruthless; relentless