Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
perfunctōrĭē, adv., v. perfunctorius fin.
perfunctōrĭus, a, um, adj. [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.