The word(s) "mendace" appears 4 time(s) in 4 verse(s) in Quran in Italian (Hamza Roberto Piccardo) translation.

(1) Le tagliarono i garretti. Disse: “Godetevi le vostre dimore [ancora per] tre giorni, ecco una promessa non mendace!”.

(سورة هود, Hud, Chapter #11, Verse #65)
(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) O popol mio, fa' [pure] quello che vuoi, ché anch'io lo farò: ben presto saprete chi sarà precipitato nel castigo abominevole, chi sarà [stato] il mendace. Aspettate! Ché anch'io aspetterò insieme con voi”.

(سورة هود, Hud, Chapter #11, Verse #93)
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(3) Se [Muhammad] Ci avesse mendacemente attribuito qualche discorso,

(سورة الحاقة, Al-Haaqqa, Chapter #69, Verse #44)
(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)

(4) il ciuffo mendace peccaminoso.

(سورة العلق, Al-Alaq, Chapter #96, Verse #16)
(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)