زَيْدٌ حَسَنٌ وَجْهًا.
Wajhan is an accusative indefinite specification (tamyīz), identifying the aspect in which Zayd is handsome. It is not a true direct object.
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Accusative Indefinite Dependent
Ṣifah Mushabbahah: Stable Qualities, Government and 18 Patterns
زَيْدٌ حَسَنٌ وَجْهًا.
Wajhan is an accusative indefinite specification (tamyīz), identifying the aspect in which Zayd is handsome. It is not a true direct object.