Lewis Short
(adjective) : sur-rustĭcus (subr-), a, um
* Somewhat clownish or rustic: sonare subagreste quiddam planeque surrusticum,Cic. Brut. 74, 259; id. Or. 48, 161: pudor quidam paene surrusticus,id. Fam. 5, 12, 1.— * Adv.: surrustĭcē, somewhat clownishly, Gell. praef. § 10.
Charlton T. Lewis, Charles Short, A Latin Dictionary