大謬不然 [－谬－－]

Jyutping daai6 mau6 bat1 jin4
Pinyin dà miù bù rán

Definitions (Wiktionary)
  1. phrase, idiomatic, literary
    to be utterly wrong; to be grossly mistaken
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）