The word(s) "forsooth" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) They said: O Shu'aib! does your prayer enjoin you that we should forsake what our fathers worshipped or that we should not do what we please with regard to our property? forsooth you are the forbearing, the right-directing one.

(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) Taste; you forsooth are the mighty, the honorable:

(سورة الدخان, Ad-Dukhaan, Chapter #44, Verse #49)
(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)