Lewis Short
(adjective) : perfunctōrĭus, a, um, perfunctus; despatched, i. e.
* Done in a careless or superficial manner, slight, careless, negligent, perfunctory (jurid. Lat.): examinatio,Nov. Val. 3, Postul. 2, 11, c. l. § 1: genitus,Ambros. in Psa. 37, § 37.—Adv.: per-functōrĭē, slightly, carelessly, negligently, perfunctorily (late Lat.): me coepit non perfunctorie verberare,Petr. 11: facere aliquid, Cod. Th. 12, 3, 2; cf. ib. 14, 9, 1.
Charlton T. Lewis, Charles Short, A Latin Dictionary