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

(1) Then the people of Pharaoh picked him up (from the river): (It was intended) that (Moses) should be to them an adversary and a cause of sorrow: for Pharaoh and Haman and (all) their hosts were men of sin.

(سورة القصص, Al-Qasas, Chapter #28, Verse #8)
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(2) Doth not man see that it is We Who created him from sperm? yet behold! he (stands forth) as an open adversary!

(سورة يس, Yaseen, Chapter #36, Verse #77)
(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)