per-dīlĭgens — Lewis & Short
per-dīlĭgens, entis, adj.,
I very diligent:
homo,Cic. Q. Fr. 3, 5, 6.—Adv.: perdīlĭgenter, very diligently, Cic. Att. 1, 11, 1:
complecti aliquid,id. Brut. 3, 14.