Lewis & Short

dēfunctōrĭus, a, um, adj. [defungor], quickly despatched; slight, cursory (post-Aug.; for class. negligens, levis): apodixis, Petr. 132, 10: ictus, id. 136, 5.
Adv.: dēfunctōrĭē, slightly, cursorily: agere causam, Sen. Contr. 5, 31 fin.: petere aliquid, Dig. 38, 17, 2.