When ال is removed from an ism manqus, its final ya is omitted in the indefinite nominative and genitive forms, and tanwin kasr appears on the preceding letter.
الْبَاقِي → بَاقٍ
الْقَاضِي → قَاضٍ
الْهَادِي → هَادٍ
الدَّاعِي → دَاعٍ
The written form has lost the ya, but the word remains an ism manqus by origin.
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Ism Manqus: Case, Dual and Sound Plurals
When ال is removed from an ism manqus, its final ya is omitted in the indefinite nominative and genitive forms, and tanwin kasr appears on the preceding letter.
الْبَاقِي → بَاقٍ
الْقَاضِي → قَاضٍ
الْهَادِي → هَادٍ
الدَّاعِي → دَاعٍ
The written form has lost the ya, but the word remains an ism manqus by origin.