蠻不講理 [蛮－讲－]

Jyutping maan4 bat1 gong2 lei5
Pinyin mán bù jiǎng lǐ

Definitions (CC-CEDICT)
  1. completely unreasonable
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    rude and unreasonable