The word(s) "piercing" appears 3 time(s) in 3 verse(s) in Quran in Muhammad Pickthal translation.

(1) Save him who snatcheth a fragment, and there pursueth him a piercing flame.

(سورة الصافات, As-Saaffaat, Chapter #37, Verse #10)
(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) (And unto the evil-doer it is said): Thou wast in heedlessness of this. Now We have removed from thee thy covering, and piercing is thy sight this day.

(سورة ق, Qaaf, Chapter #50, Verse #22)
(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)

(3) - The piercing Star!

(سورة الطارق, At-Taariq, Chapter #86, Verse #3)
(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)