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

(1) Those who do not believe in it would hasten it on, and those who believe are in fear from it, and they know that it is the truth. Now most surely those who dispute obstinately concerning the hour are in a great error.

(سورة الشورى, Ash-Shura, Chapter #42, Verse #18)
(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 certainly he warned them of Our violent seizure, but they obstinately disputed the warning.

(سورة القمر, Al-Qamar, Chapter #54, Verse #36)
(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)