A diptote is not an indeclinable noun.
إِبْرَاهِيمُ occurs in the nominative, while إِبْرَاهِيمَ occurs in the accusative and (normally) genitive; it has syntactic case.
A mabnī word has a fixed building, while a ghayr munṣarif is inflected but has restricted case markers and tanwīn.
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Diptote Causes — Foreign Origin and Its Conditions
A diptote is not an indeclinable noun.
إِبْرَاهِيمُ occurs in the nominative, while إِبْرَاهِيمَ occurs in the accusative and (normally) genitive; it has syntactic case.
A mabnī word has a fixed building, while a ghayr munṣarif is inflected but has restricted case markers and tanwīn.