per-dīlĭgens, entis, adj.,
very diligent : homo, Cic. Q. Fr. 3, 5, 6.—Adv.: perdīlĭgenter , very diligently , Cic. Att. 1, 11, 1: complecti aliquid, id. Brut. 3, 14.
per-dīligens entis, adj.,very diligent. ...
An Elementary Latin Dictionary