Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
con-fābŭlor, ātus, āri, v. dep. n. and a., to converse together, to discuss something with one (ante-class. and colloq. for colloquor): cum aliquā, Plaut. Merc. 1, 2, 76; cf. absol., id. ib. 3, 3, 10; so, ad aliquam accedere Confabulatum, Ter. Hec. 1, 2, 107: de aliquā re, Varr. ap. Gell. 13, 11, 5.
With acc.: rem magnam cum aliquo, Plaut. Cist. 4, 2, 77.