不堪回首 [－－－－]

Jyutping bat1 ham1 wui4 sau2
Pinyin bù kān huí shǒu

Definitions (CC-CANTO)
  1. too embarassing or painful to look back into one's memory
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    cannot bear to look back on; to find it unbearable to recall