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Jyutping man6 sam1 mou4 kwai5
Pinyin wèn xīn wú kuì

Definitions (CC-CEDICT)
  1. lit. look into one's heart, no shame (idiom); with a clear conscience
Definitions (粵典–words.hk)
  1. 語句
    憑住​良心​自我​反省​,​都​冇​任何​嘅​慚​愧​不安
    to have a clear conscience
    • 你做咗咁多錯事,仲敢話你問心無愧?
      你做咗咁多错事,仲敢话你问心无愧?
      nei5 zou6 zo2 gam3 do1 co3 si6, zung6 gam2 waa6 nei5 man6 sam1 mou4 kwai5?
      How could you claim to have a clear conscience after you have done so many wrong things?
  2. 近義詞
    問得心過
Definitions (Wiktionary)
  1. phrase, idiomatic
    to feel no qualms upon self-examination; to have a clear conscience
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    问心无愧是一个非常柔软的枕头。
    問心無愧是一個非常柔軟的枕頭。
    wèn xīn wú kuì shì yí gè fēi cháng róu ruǎn de zhěn tou 。
    • A clear conscience is an extraordinarily soft pillow.
  2. Mandarin
    问心无愧是一个成语。
    問心無愧是一個成語。
    wèn xīn wú kuì shì yí gè chéng yǔ 。
    • "Having a clear conscience" is an idiom.
Examples (粵典–words.hk)
  1. Cantonese
    问心无愧
    問心無愧
    man6 sam1 mou4 kwai5
    • to have a clear conscience
  2. Cantonese
    你做咗咁多错事,仲敢话你问心无愧?
    你做咗咁多錯事,仲敢話你問心無愧?
    nei5 zou6 zo2 gam3 do1 co3 si6, zung6 gam2 waa6 nei5 man6 sam1 mou4 kwai5?
    • How could you claim to have a clear conscience after you have done so many wrong things?