朽木糞牆 [－－粪墙]

Jyutping nau2 muk6 fan3 coeng4
Pinyin xiǔ mù fèn qiáng

Definitions (Wiktionary)
  1. phrase, idiomatic
    an unsalvageable situation
  2. phrase, idiomatic
    a person whose spirit is rotten cannot benefit from education