牢不可破 [－－－－]

Jyutping lou4 bat1 ho2 po3
Pinyin láo bù kě pò

Definitions (CC-CANTO)
  1. (proverb) something is very strong and unbreakable indissoluble; Or someone's belief is adamant.
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic, of abstract things, usually
    unbreakable; indestructible
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）