زَيْدٌ حَسَنُ الْوَجْهِ.
Ḥasanu is a nominative predicate and muḍāf, without tanwīn. Al-wajhi is genitive as muḍāf ilayh; this is a formal (lafẓiyyah) iḍāfah construction.
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Genitive through Idāfah
Ṣifah Mushabbahah: Stable Qualities, Government and 18 Patterns
زَيْدٌ حَسَنُ الْوَجْهِ.
Ḥasanu is a nominative predicate and muḍāf, without tanwīn. Al-wajhi is genitive as muḍāf ilayh; this is a formal (lafẓiyyah) iḍāfah construction.