فُؤَادهُمْ
Appears 2 times in the Quran.
(Root: فاد)
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6:110 وَنُقَلِّبُ أَفْـِٔدَتَهُمْ وَأَبْصَٰرَهُمْ كَمَا لَمْ يُؤْمِنُوا۟ بِهِۦٓ أَوَّلَ مَرَّةٍ وَنَذَرُهُمْ فِى طُغْيَٰنِهِمْ يَعْمَهُونَ
And We will turn their hearts and their sights, even as they did not believe in it the first time, and We will leave them in their inordinacy, blindly wandering on.
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14:43 مُهْطِعِينَ مُقْنِعِى رُءُوسِهِمْ لَا يَرْتَدُّ إِلَيْهِمْ طَرْفُهُمْ وَأَفْـِٔدَتُهُمْ هَوَآءٌ
Hastening forward, their heads upraised, their eyes not reverting to them and their hearts vacant.