Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nĕgōtĭŏlum (nĕgōc-), i, n. dim. [negotium], a little business, small matter: erit nescio quid negotioli, Cic. Q. Fr. 3, 4, 6; Plaut. Fragm. ap. Prisc. p. 616 P.