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Jyutping min6 mung2 sam1 zeng1
Pinyin miàn měng xīn jīng

Definitions (CC-CANTO)
  1. to play the fool and feign ignorance
Definitions (粵典–words.hk)
  1. 語句
    形容​一個​人​睇​落​或者​扮到​有​啲​鈍​鈍​地​,​但​其​實內​裏​好​醒目
    to play the fool and feign ignorance; to appear or pretend to be stupid but to be actually very smart or cunning, literally "face foolish heart cunning"
  2. 反義詞
    鱷魚頭老襯底
Definitions (Kaifangcidian)
  1. 裝傻 – 装傻
  2. 似傻非傻
  3. 外拙內秀 – 外拙内秀
Examples (粵典–words.hk)
  1. Cantonese
    面懵心精
    面懵心精
    min6 mung2 sam1 zeng1
    • feigned stupidity
    • Someone appears to be stupid but is actually smart or cunning
    • appearing or pretending to be stupid but actually very smart or cunning; literally: face foolish heart clever