The word(s) "smoothly" appears 3 time(s) in 3 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) Your Lord is He That maketh the Ship go smoothly for you through the sea, in order that ye may seek of his Bounty. For he is unto you most Merciful.

(سورة الإسراء, Al-Israa, Chapter #17, Verse #66)
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(2) "My breast will be straitened. And my speech may not go (smoothly): so send unto Aaron.

(سورة الشعراء, Ash-Shu'araa, Chapter #26, Verse #13)
(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) And His are the Ships sailing smoothly through the seas, lofty as mountains:

(سورة الرحمن, Ar-Rahmaan, Chapter #55, Verse #24)
(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)