The word(s) "heinous" appears 2 time(s) in 2 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) If ye (but) eschew the most heinous of the things which ye are forbidden to do, We shall expel out of you all the evil in you, and admit you to a gate of great honour.

(سورة النساء, An-Nisaa, Chapter #4, Verse #31)
(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) Allah forgiveth not that partners should be set up with Him; but He forgiveth anything else, to whom He pleaseth; to set up partners with Allah is to devise a sin Most heinous indeed.

(سورة النساء, An-Nisaa, Chapter #4, Verse #48)
(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)