A fiʿl lāzim (intransitive verb) is complete with its subject and does not require a direct object in its basic construction.
جَلَسَ زَيْدٌ — Zayd sat.
ذَهَبَ عَمْرٌو — ʿAmr went.
In the first example, زَيْدٌ is the one sitting. No second participant is required as the direct object of “sit.” In this construction, the verb is intransitive.
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Intransitive verbs
Introduction to ʿIlm al-Ṣarf and Basic Terminology
A fiʿl lāzim (intransitive verb) is complete with its subject and does not require a direct object in its basic construction.
جَلَسَ زَيْدٌ — Zayd sat.
ذَهَبَ عَمْرٌو — ʿAmr went.
In the first example, زَيْدٌ is the one sitting. No second participant is required as the direct object of “sit.” In this construction, the verb is intransitive.