The word(s) "discerning" appears 2 time(s) in 2 verse(s) in Quran in Saheeh International translation.

(1) They said, "O Shu'ayb, does your prayer command you that we should leave what our fathers worship or not do with our wealth what we please? Indeed, you are the forbearing, the discerning!"

(سورة هود, Hud, Chapter #11, Verse #87)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)

(2) To Pharaoh and his establishment, but they followed the command of Pharaoh, and the command of Pharaoh was not [at all] discerning.

(سورة هود, Hud, Chapter #11, Verse #97)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)