يَرْضَى → لَمْ يَرْضَ
Translation: He is pleased → He was not pleased.
يُرْضَى → لَمْ يُرْضَ
Translation: He is approved of → He was not approved of.
When a weak-final imperfect becomes jussive with lam, its final alif is deleted. The stem now ends in ḍād with a fatḥah. By contrast, لَنْ يَرْضَى is subjunctive and retains the written final alif.
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Jussive Deletion of Final Alif
Full Conjugation of the Wāw-Final Verb رَضِيَ يَرْضَى
يَرْضَى → لَمْ يَرْضَ
Translation: He is pleased → He was not pleased.
يُرْضَى → لَمْ يُرْضَ
Translation: He is approved of → He was not approved of.
When a weak-final imperfect becomes jussive with lam, its final alif is deleted. The stem now ends in ḍād with a fatḥah. By contrast, لَنْ يَرْضَى is subjunctive and retains the written final alif.