استجهلهُ

He reckoned him, or esteemed him, جَاهِل [or ignorant, &c.]. (S, TA.)

He, or it, excited him to lightness, or levity, and unsteadiness. (S, K.)

اِسْتجْهَلَتِ الرِّيحُ الغُصْنَ (tropical:) The wind put the branch into a state of commotion. (K, TA.)