苦大仇深 [－－－－]

Jyutping fu2 daai6 sau4 sam1
Pinyin kǔ dà chóu shēn

Definitions (CC-CEDICT)
  1. great bitterness, deep hatred (idiom); deeply ingrained long-standing resentment
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    great hate and bitterness