ثُمَّ الْمَعْنَوِيُّ إِنْ كَانَ ثُلَاثِيًّا سَاكِنَ الْأَوْسَطِ غَيْرَ أَعْجَمِيٍّ، يَجُوزُ صَرْفُهُ وَتَرْكُهُ؛ لِأَجْلِ الْخِفَّةِ وَوُجُودِ السَّبَبَيْنِ كَ«هِنْدٍ».
Translation: If a semantically feminine name has three letters, its middle letter is vowelless, and it is not foreign, both full and restricted declension are permissible, as with Hind.
All three conditions must be met. The author also mentions phonetic lightness alongside the two causes.
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Causes of Diptote Status — Femininity and Its Conditions
ثُمَّ الْمَعْنَوِيُّ إِنْ كَانَ ثُلَاثِيًّا سَاكِنَ الْأَوْسَطِ غَيْرَ أَعْجَمِيٍّ، يَجُوزُ صَرْفُهُ وَتَرْكُهُ؛ لِأَجْلِ الْخِفَّةِ وَوُجُودِ السَّبَبَيْنِ كَ«هِنْدٍ».
Translation: If a semantically feminine name has three letters, its middle letter is vowelless, and it is not foreign, both full and restricted declension are permissible, as with Hind.
All three conditions must be met. The author also mentions phonetic lightness alongside the two causes.