ثَقِيلَةٌ، أَيْ: مُشَدَّدَةٌ.
Translation: The heavy nūn is doubled.
Iḍribanna has heavy nūn with shadda and fatḥa. The two endings both intensify but are morphologically distinct.
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Heavy Nūn: Doubled
The Two Emphatic Nūns: Forms and Rules
ثَقِيلَةٌ، أَيْ: مُشَدَّدَةٌ.
Translation: The heavy nūn is doubled.
Iḍribanna has heavy nūn with shadda and fatḥa. The two endings both intensify but are morphologically distinct.